Sounds like she may have a mild case of IC, which seems to be on the rise - I keep hearing of women who have it.
I have a friend who went on a very strict IC diet and now it's completely under control.
Does this sound like what she has?
http://kidney.niddk.nih.gov/kudiseases/pubs/interstitialcystitis/
We have not had an ultrasound yet. It does not hurt her to urinate. The burning comes on at random times; sitting, standing, running....
burning in the bladder? i take it u mean burning on peeing? have they done an ultrasound? it could be something obstructing the outflow from the bladder or affecting pressure. i think soetimes u can get a small stone somewhere. its a tough one.