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Bring her in. She only stands a 3%-5% chance of survival out there. A takeout food container or Tupperware with a clear lid will work. Line the bottom with a paper towel. Get a small tender milkweed leaf (the one she is chomping is fine) and wrap the bottom in a slightly dampened piece of paper towel and put in there so she can chomp away. Open the container twice a day to let air in, but watch carefully, they’re escape artists!

After she is a little bigger you can set her up in a little butterfly enclosure. Be on the lookout for more eggs on the milkweed. They’re often underneath the leaves, and many prefer to lay on the smaller, younger leaves, too.

Good luck! Also, there’s an info heavy Facebook group that’s great for research called The Beautiful Monarch. It got me through my first two batches with ease!

Edit to add: make sure to wash hands before and after handling. They’re sensitive to lotion/flea products on pets we may pet, etc. etc. etc. And after you handle milkweed, do not touch anything. If that sap gets in your eyes you can do major damage. Wash your hands after handling milkweed, always.

I’m in Jacksonville, so about 3 hours from Tallahassee. A majority of my plants are in pots, but I do have quite a few in the ground. The ones that are in the ground I look over and find caterpillars and put them in the butterfly house. Having milkweed in pots makes it easier to rotate food in and out of the house.
I put a link for the butterfly house, it’s nothing fancy, but it works very well.

netted butterfly safe house

Yes, I have three fine mesh habitats for the caterpillars I collect from my yard milkweed plants. I keep the habitats on my semi enclosed front porch with potted milkweed. Most of the time the cats crawl to the top to form their chrysalis, but sometimes the form in odd or unsafe locations and I take them and hang them with clips or thread. The fine mesh helps keeps out flying insect predators. This dude formed his chrysalis under a leaf that was then eaten by other caterpillars so I had to cut the leaf off the plant and hang him up. I have these habitats in white, but in the future I will be getting the black mesh as they are easier to see through than the white.

They've been doing it since the 60s. I read a book on it when I was a kid (I'm 60 now), just follow the instructions, it doesn't seem to bother them.

Edit: This book