There is many people who are Bi-sexual and it does not mean the end of the world, Both males and females experiment in their teen years having Bi-sexual relationships with the members of the same sex , I had a Bi-sexual relationship I am now Age 41 , And I am strictly straight into women , I think these are phases young people go through , It's better than her getting pregnant And having babies , If she wants to experiment sexually with another female , That should be her deal , She may some day down the road look at this situation , And say Ewwww how could have I , She is probably going through mixed emotions too , On what her sexuality really is than again none of us can do anthing life is life I just hope she practices safe sex with both males and females , You should talk to her about it that will let her know that has a friend that you care