Surely leavin it untill Monday is a little long for such a small momma? Especially when there are harmless natural things like the soluable powder to give? She will need Loads of water if it's so runny- she could dehydrate fast- but then again it may keep it runny...
From tour wording 'I guess we just wait...' are you happy with her advise? Any good vet won't mind you getting a 2nd opinion if your not to sure...
I also can't remember how she is cut, but it may be an idea to clip her back end really short to stop it sticking during the night... Poor baby
! Give her a hug from me!