Have you tried leaving her carrier out and open so she can explore it? My kittens sometimes like to nap and play in theirs, so it just sits on the floor in their room. Try putting it out somewhere and put a few treats and some toys inside, and maybe a towel so it smells like home.
For the fleas, boil 2-3 lemons very thinly sliced with some chopped rosemary in a pot with a lot of water (~a gallon). Let it sit over night, strain, wash the cat with some citrus-scented soap (I used lemon joy on mine) and rinse with the lemon-rosemary water. Fleas hate the oils in citrus, and will actually jump off the cat! You will have to pick of and crush the fleas, but your cat will thank you. Make sure to change the babies bedding, and throw away your vacuum bag after cleaning. Also, you can add lemon oil and ground rosemary to talc or cornstarch and sprinkle that on rugs to kill flea eggs. I did the bathing and one dose of Frontline when I got my flea-ridden kittens, and I haven't seen one bug since.