If I tell my Best friend, her parents won't let us hang out anymore.

So I am 15 years old and I have so far come out to my mom and my aunt and her partner. I have received a lot of support from them and I would really like to come out to my best friend. I know that she will be supportive as well. The problem is that her parents are kind of homophobic. I am pretty sure that when I do come out to her, they will not let us hang out anymore, and I don't know if I could handle that. She is like my sister. I feel like I am lying to her by not sharing such a big part of myself with her because we pretty much tell each other everything. I don't know if I should tell her now or try to wait it out until we are out of high school.