I know that when I dated this guy, I knew, but I didn't tell him because it's just not something I used to be vocal about. I wanted to see where it was going before trusting him with my "big secret." Long story short, we dated a year and I never thought too much about it, never was the right time. My husband and I have been together for longer than you guys, and I never wanted him to know MI runs in my family. When I was diagnosed, it took a while for him to adjust. He always just thought I was "dramatic and weird." Give her some time imho.