Reddit reviews Cat vs. Cat: Keeping Peace When You Have More Than One Cat

Your problem is... you have a kitten.

Honestly, all of this sounds like a normal young cat with a lot of energy who's bored out of her mind. Different cats have different energy levels, and your mom also had multiple cats together. Your kitten is alone, so all of her entertainment comes from you or from finding things to do herself, many of which won't please you. I would check out something like this book, which is a quick, easy read and covers strategies for all of the problems you're having. In brief, here are some things to try:

• Scratching: Offer lots of acceptable scratching surfaces, both vertical and horizontal. Sisal posts and pads as well as cardboard are all great and really cheap. Put them in areas where your kitten likes to scratch. If you see her scratching the carpet, pick her up and gently move her to the scratching toy. If necessary, reward her with a treat the first few times she uses the toys.
  
• Scratching: At the same time, you want to make the carpet less appealing to scratch. Try putting down double-sided tape or tinfoil in the affected areas. Both of these are cheap, easy to remove, and won't hurt the cat or the carpet.
  
• Scratching: Keeping the cat's claws trimmed will also reduce her need to scratch, but keep in mind that scratching is completely healthy and necessary for all cats. (For one, it's how they stretch their back muscles.) If you're totally unable to get the scratching under control with toys, you might also look into getting Softpaws for her, but you probably won't need to.
  
• Activity at night: Cats are most active in the evening by nature; they're technically crepuscular. To help you get your sleep anyway, you'll need to do multiple play sessions in the afternoon and evening. Yes, that takes time, but it's a pretty fun investment in a good night's sleep. Laser pointers, Da Bird-style toys, and this weird thing are all great for high-energy play. Cat playtime should mimic hunting and stalking prey, so avoid just waving a toy in her face (which can get the cat frustrated and more wound up). Hide the toy in various spots around the house, peeking out just a bit, and make her hunt it. Make her run and jump. With my 16-month-old, playtime isn't really done until he actually starts panting. (Be reasonable with this, obviously.)
  
• Meowing: I would revise feeding times. Ideally, you should play with the kitten before bedtime, then feed her. That way she'll be worn out and ready for a long nap when you go to bed. If you're currently free-feeding, consider moving to one or two distinct feeding times. This will allow you to make food a bonding event, and if you play with her before feeding time, you'll also reinforce the sense that she's hunted successfully and can now settle down. Important: Avoid feeding her first thing in the morning, which will encourage her to meow at your door to get you out of bed. My cats eat dinner when I come home from work, then have playtime and treats right before bed. (They eat high-quality dry food for treats, but they're kind of weird.)
  
• Activity at night: Simply speaking, your cat gets bored at night, so offer entertainment that doesn't involve harassing you. There are lots of inexpensive toys she can use by herself, including puzzle toys that dispense treats. Leave her with one or two each night; change it up to keep her interested. A cat tree by a window can be a good way to let her observe nocturnal wildlife and secure her territory, and it can be a good place for her to sleep as well. If you can get her sufficiently worn out before bedtime to make this feasible, I've found that letting my cats sleep in my bedroom actually keeps them calmer and quieter. They take their cues from us settling down and going to sleep, and they feel safe to do the same. My older cat would meow at the door all night when she was young too, and we didn't start getting normal sleep until we let her sleep with us.
  
• Deterrents: You've already figured this out, but punishing cats doesn't really work. They don't understand what's going on and can get anxious and neurotic, and if they're sufficiently bored, even getting water sprayed at them can be a fun way to get attention. The best way to modify cat behavior is usually to offer more fun and interesting alternatives, while making the undesirable behavior less fun and more difficult. In your case, your kitten has figured out that meowing at your door will get you to interact with her for a solid hour and a half. To avoid this, something like the Ssscat may be a good way to keep her away from the door at night without interaction from you. However, you'll have to do this in addition to, not instead of, all the stuff above; otherwise she'll just meow at your door from three feet away.
  
  Good luck!
  
  Edit: I fail at Reddit formatting, apparently. ;_;

> extremely territorial with other cats

Just FYI: if you know and have access to the cat you may adopt. there are steps you can take to make this easier for you (her). it's not a deal killer, it just makes in more challenging.

EDIT: There are great books on the topic. Doing this successfully takes time on your part (up to a month or two), but biology is on your side. You may be able to make it work.

Look into: http://www.amazon.com/Cat-Vs-Keeping-Peace-ebook/dp/B001QL5MSW/ref=sr_1_2?ie=UTF8&qid=1381274840&sr=8-2&keywords=multiple+cats+book

The author is legit; I own this book from her, as well as others.