If here fingers are stuck together, then she needs repeated applications of nail-polish remover (acetone based) as suggested, and a little warm water to soak in after. Should then be able to gently peel them apart. If not, she needs to go to an emergency room before it "sets" too much (like within 24 hours, otherwise bonded skin can "grow" together.

If her fingers aren't stuck together, just wave them around to dry before applying acetone. The glue won't help her skin tone , but it won't do any damage either. They use superglue for wounds now instead of sutures - it's a medical grade glue, but a similiar composition, so the normal stuff won't harm her much (apart from sticking her to things in the first few seconds).

The things you people ask on a tech forum