So that is almost certainly a well established infection, no need to confirm. I have seen false positives higher than that, but rarely. And we also cannot know when you were infected.
Herpes is not always passed to sexual partners, certainly not when men use condoms with uninfected women as condoms reduce transmission by 96% from men to women.
And if she happened to become infected in the past 3 months, it may not show up on her IgG test quite yet.