Asking out a girl

There is this girl I met a year and a bit ago that I really like when I first met her. I didn’t pursue anything because I thought u had zero chance with her. A little while ago I found out that I might actually have a chance with her. So the last few months I have been talking to her more whenever our group have met up and I think I have laid a solid foundation for me to ask her out. Issue is that I don’t want to ask her out and ruin the friendship we have or she starts not showing up to group meetings because of it. She is also the best friend of another female friend of mine who is also my mate girlfriend and I don’t want to make it awkward for them. Any advice?