If she is truthful then you would have no risk from getting a STD from her.
The girl told her sexual history comprises of her performing mutual masturbation with one ex-boyfriend. That is absolutely it.
Neither her, nor her ex-boyfriend ever had prior sexual contact with anyone.
So my question is does this rule out her giving me any STDs? (because she's been in a monogamous relationship with only one guy before AND the guy himself only had one monogamous relationship with her)?
Am I at higher risk at getting herpes, Hep B, gonorrhea, syphilis due to my balantis (possibly zoon's balantis)?
I don't know if she can get thrush, but you can get a STD.
Yes, but I'm asking if I have Zoon's balanitis specifically, can I receive unprotected oral sex?
Am I not prone to getting an STD as I have inflammation and possible small amount bleeding? (which means openings on glans of my penis)? Can't this lead to bacteria more easily being transmitted in my penis.
Also can the girl who's giving me oral sex get thrush from my balanitis?
http://www.bad.org.uk/for-the-public/patient-information-leaflets/zoons-balanitis#.U7rq8txq2YF
Oral sex is low risk for STD's.