If you already have HSV1 and she had HSV1 on her mouth, what are you worried about? You already have it. You can't get it twice. You are fine.
worried it will spread to my genitals.
It doesn't work that way. HOWEVER, there is a way it can happen and that is when you first contract HSV1 and let's say you break the blister or somehow are able to rub the virus from your lip to your penis, it is possible since your body doesn't have the antibodies to fight it off. If you have it and have had it, this isn't possible. Your body basically has a vaccine against it now. You can still get HSV2 though since it's a different strain. Herpes has many strains. The most popular one that many have heard of and had is Chicken Pox.