I would probably forgo the acrylics and use natural varnish. But if your daughter is past the "I'll put anything in my mouth" phase, just use acrylics and ask in the DIY which varnish is recommended for toys.
I actually use cut up, B-grade blankets and pillows, sold in 15 kilo boxes on eBay. The stuffing is way better than what regular craft stuffing is (softer, easier to handle), and because of the huge box, way cheaper as well.
Delphi has decal paper that can be printed with old-style printers, then fused onto the glass - it turns sepia, though. If you want to be 100% sure that it is okay for dishware, fuse another layer of clear glass on top.
With the bunny, the ears are made first, inside out, then the legs, leaving an opening. I then stuff everything, stitch the face, then close the gap. Tiny stitches pulled together get the neck.
The blimp is even easier, because the face is done in felt and it only has ears.
When buying socks, just make sure they have been tested for toxics (most will), and that you use smaller sizes without a huge amount of stretch - I was surprised once how large baby socks could get when stuffed.
I am picking up my Uhlig U15 900W kiln tomorrow, will hopefully get started sometime this month. I actually read through "Introduction to Glass Fusing" by Petra Kaiser already and picked up loads of hints.
Now I have ordered 4lbs of COE90 in the States, since it is a hassle to get it in Germany, and will start buying a glass cutter, a Morton cutting board, some temperature indicator, bails, fiberboard, etc...