My teenage daughter is having a lesbian relationship with older girl

Although, it is illegal.most kids are doing stuff. you can't protect her from it(dreading these upcoming years with mine) she's going to do it wether you say yes or no. I I guess least with a girl she can't get pregnant. I'd maybe make sure she's spending lots of time with her friends her age,arrange sleepovers at yours for them or suggest dates like bowling ice skating etc,make her too busy to see this girl but tactfully