My older glider (of 2) got her back toenails stuck in her bedding. It looks like she may have bitten herself trying to get free. There is dried blood but no open wound that I can see and she is favoring that foot. I have separated them because the younger one wants to "help" her sister but that only annoys the older one. Any advice on tending to the foot?

Get her to a glider experienced vet right away. If not treated properly the open cut can get easily infected.

What kind of "bedding?"

It was a fleece pouch they could crawl into to sleep. She got stuck on the seam inside and couldn't free herself, we had to cut the bedding away from her foot.

Advice for the foot - let a vet look at it. Its not possible for forum ppl to give u any other advice, Im sry to say. The foot could possibly be infected, and left untreated... I really don't wish to say.. you know what needs done tho.