While it's not impossible that you vectored something, it does sound unlikely that the most likely cause of a vaginal ulcer... Um, that sentence got too convoluted. Let me start over. >_>

It doesn't sound probable that you vectored HSV to her, so with luck, it'll be something very simple to cure. Maybe even just a friction burn/blister, if she self-penetrates with larger toys? (I have a suspicion that I managed to give myself something along those lines, once... >_> Slightly embarrassing details available upon request, though, for educational purposes. *wry grin*)

Anyway, still wishing luck to y'all!