Most mollusca cases I see, including those in the groins of adults, are not contracted from anyone. In your case, I am skeptical that the bump you had was a molluscum at all. 7 days is in general far too short for you to have contracted in from her. It was probably just a blocked pore that you would have ignored if you weren't focused on molluscum. I don't see why she would think she got them from you. I suggest she have hers treated, and that both of you be checked to be sure you either have or don't have them, and that you're treated if you do. No need and no point to complicate your relationship over this.
Take care.
Dr. Rockoff