Sometimes even the best of friends disagree on things. My best friend and I don't see eye to eye on a couple of issues so we've agreed to not discuss those issues so that we don't risk saying or doing something that would cause a rift. Maybe you need to sit down with your friend and tell her you don't agree with her view on this matter. Tell her that will not change how you feel about her and the friendship you share. Explain to her that you don't feel comfortable discussing that subject and that in order to prevent possible friendship meltdown, you'd like to refrain from talking about it. Sometimes there are things that even friends should not get into.