[RustysMom]

I will try to help based on years of fostering and having my own pack. When you bathe dunk the head to get it really wet. Fleas don't like water and go to dry hair. If her face is not throughly wet, they will run there, while you wash the rest of her. Check her ears to make sure they are not hiding there.
Use dish washing soap. Any kind. After her bath, towel dry, lay her down on her back first and look for the fleas and dislodge them with a flea or cat comb. Put them into a small cup with water and soap AND a lid so that they cannot jump out.
With her bath water, leave it sitting in the tub for about an hour or so, so that they will drown (I learned years ago that fleas can hold their breath or whatever for about an hour in water, so you want to catch the water in a tub and let it sit until you are sure they have drown)
You can also fill a small spray bottle with water and soap and spray it on any flea you see, comb it up, then put it in the covered cup.

This will hold you until the vet opens on Tuesday.

If you have carpet in your house that she walked on, it wouldn't hurt to treat it before the flea eggs hatch out. Then you have BIG problems if they do.