You need to wait. Feeding too soon will cause another regurge, which will further delay her recovery.
While you wait get the BeneBAC, or The Bean Farm carries ReptiBAC which works if you don't have a local PetSmart/Petco that carries ReptiBAC. I prefer to dust a wet f/t feeder with a pinch of it rather than putting it in their water, as then I know the snake injested some.
In the meantime you need to figure out why she regurged. It could simply be that four mice was too big of a meal, or it could be that her hot side, which you think is 90*F, really isn't. What is the surface temperature on the warm side, under the hide?
Also this will probably sound rather gross, but... did the mice look more-or-less intact, or did she mainly puke up liquid and some hair? If the mice were intact then she's not digesting, that's another clue to check your temps. If they were mostly gone then the meal was probably too much for her.