Stop! I know this post may be too late but if the she ate through her bandage and stitches, she NEEDS TO GO TO THE VET! My daughter is a veterinary technician and she says that is the best (safest) thing to do.
NEVER use alcohol on a wound as it kills cut tissue and then you have a whole other set of issues. Baby oil is also not a good thing to put on a wound as it's meant for external use only.
During the surgery there would have been a sub-cutaneous layer of stitches, so there is no risk of her wound opening up all the way. The problem here is that of doing damage to the skin layer of the wound.
If many stitches were chewed out and it's a large wound, then leave the bandaid and get her to the vet. If it's just a very small wound then you can have someone hold the dog and, using gentle pressure, hold down the skin with one hand and GENTLY work the bandaid loose. Take your time and try not to pull the edge of the wound any more than you have to. This WILL be uncomfortable for the dog so be warned that she may react.
In the meantime, you can try putting an old piece of clean clothing over the wound and replacing the eliz. collar....just keep a close eye on her.
If you need anymore info pls PM me. My daughter lives with me, so she's available to answer your questions.