Just so you know what happened to the first quilt, some of the old dyes were almost acidic and they ate the fabric away on the one quilt with the centers all missing! For that one I would think you could go ahead and get a close match on fabric color and applique another square right over the shredded pieces.
I really like the pink & white friendship star, probably a little girl's quilt, do you think it can be saved? I would give it a try, make honest patches and fix it the best you can.
As for the 4th one, you can replicate the pattern and applique the repair on top again, and the crazy quilt will be just plain fun to fix up! All in all, a great gift, to be sure!
Your daughter is darling, but how did she have so many bugs available this time of year? Did she already have her creepy crawlie collection started?