Use Ivory Dishsoap and wash her -- we had the same problem when we found Tink -- she was 2 weeks old and covered in fleas. Give her a few baths (with breaks in between) and start at her neck and work down, getting it to foam -- it sufficates the fleas and they fall off. Pick/comb as many off as you can while the soap is on, rinse, and let her settle down. Then go again.
It's a hard process but it works...we got 90% of the fleas off of her with about four baths. We kept doing it once a day after that.