I can't advise on the problem, but IMHO if you are in any way worried then
go to your vet. Maybe your vet makes house calls, worth asking..?

Hope it all goes well, purrs to your kitty :-)

Ivor

Is she an outdoor cat?  Many non-medical possibilities there.
Could be a "hot spot" -- more common in dogs, irritation at the spot causes
animal to rub, chew or pull fur out. Some medical issues also cause loss of
hair and although the books suggest it should be symmetrical, gosh-darn-it
cats can't read and may not follow the literature.
If you are very worried about your cat at the vet, check out if there is a
vet in your area that travels to homes, or try a cat-only clinic (little
less stressful on our purring friends).
good luck.
Carla

Ringworm.

http://www.pressenter.com/~dvmvis/ringworm.htm

Take her to the vet, even if she is terrified.  She should get over this
since a trip to the vet happens at least once a year.  Try getting carrier
out RIGHT NOW.  Put nice fluffy towel in it and catnip.  Set in middle of
room w/door open.  Let her go to it in her own time and check it out.  Call
and make appt. for tomorrow.

HTH...