Who should I hang with if my best friend has no time for me anymore?

My best friend is my sister. We grew up together and essentially did everything together: movies, get food, and stuff. Nowadays she seems to be occupied somewhere else: work, other friends, she's tired etc. I get it she has other friends and stuff, but I always invite her to do stuff and she can't for whatever reason or just doesn't respond via text.I know when you grow up people can grow apart and stuff, but Idk lately I just haven't invited her to do stuff anymore and I could hang with my friends, but she was my main person to kick it with. Idk should I just give her her space and start hanging with other people?