Reddit reviews Homes Garden 4-Tier Shelves Mini Indoor/Outdoor Greenhouse Warm Tight Commercial PVC Clear Greenhouse Plant Flower Grow Tent Zipper Roll Up Front 27 in. L x 19 in. W x 63 in. H

2000 bags of shredded leaves, dumped all over your lawn. Kickstart that food forest!

I don't know if you have a greenhouse, but a small seed starting kit is timed nicely for Christmas. Some LED grow lights, a little rack system with a greenhouse tarp, maybe some seed starting trays, and some seeds of stuff she likes.

Black Friday Sales on grow lights

Indoor Greenhouse

What about indoor mushroom grow kits. Here are some vendors:

•Back to the Roots (Oakland, CA)

•Cascadia Mushrooms (Bellingham, WA)

•Far West Fungi (San Francisco, CA)

•Field & Forest Products (Peshtigo, WI)

• Gourmet Woodland Mushrooms (UK)

• Grow Mushrooms Canada (British Columbia, Canada)

• MycoTerra Farm (Westhampton, MA)

• MycoUprrhizal (Olympia, WA)

•Provisions Mushroom Farm: find them at the Olympia, WA Farmer's Market!

•SmugTown Mushrooms (Rochester, NY)

• Sno Valley Mushrooms (King County, WA)

Same thing, these may not be carbon negative by themselves, but they will make a LOT of mushrooms (if they like eating mushrooms), and can be really fun. Every mushroom they grow in their basement is a batch of mushrooms that didn't travel 1000 miles, with associated packaging, processing, etc carbon footprints.