OHSV 2 sheds infrequently and I’m surprised that she has had multiple painful outbreaks.
It is possible it could be transmitted via kissing but not likely. I am assuming that she had a positive swab test for HSV 2, is that correct? If she only has this orally, which is also rare, then the only risk is her giving you oral sex. If you use a condom when she is giving you oral sex, then the risk is virtually eliminated for you.