If you have a long term partner or enter a new relationship soon, you might want to have some tests to make sure you would not expose anyone. One concern would be herpes. Even through she did not have any lip sores at the time, shedding does occur where the virus is on the surface without any lesions.
Along the same lines as I was thinking, just wanted to see what others thought, and if there was anything else I should consider or be aware of.
Overall it sounds like she has lived a lifestyle that would put her at a higher risk for a STD, but you would still be at low risk. The low risk factor means if someone has an oral STD it is more likely not to get it then to get it.