After you vacuum, IMMEDIATELY remove the bag and get it out of your appt. Not just in your trash, completely out of the appt. Vacuum slowly and every single day for several days completely disposing of the bag every time.
We use frontline, but I also I keep Capstar around and dose it about every 4-5 days when we have fleas around. I also give Mario Capstar if we go somewhere suspect of fleas ie vet, dog park, pet store, someone's house I am unsure of, etc.....
You can give Molli benadryl (OTC) for the itching or your vet can prescribe Atarax. You may also be able to apply a steroid cream to keep her away from, and soothe the spots that are worst. Check with your vet on both those routes.
The theory is if you see one flea, there are 50 more you do not see.
Here a few website that may have ideas you have not tried yet:
How to get rid of fleas 4 Ways to Get Rid of Fleas - wikiHow Top 10 Home Remedies to Get Rid of Fleas