Do u avaoid ur family? Why?

I come from a big family......Not the most ideal family in the world. I have an older sister who is married and has children 9. She is a SAHM. She does not keep in tough with our family for teens) reasons of her own. Me and her have always been close but lately she has not been returning my calls, I send emails and I wont hear back from her.....I did email her in regards to this because I feel like i'm being X out of her life as evertone else in the family. She said she is really busy? Which I can understand. I dont understand how she can manage to make time to keep in touch with people who are thousands of miles away abut not with me and i live about 30 minutes away? Do u think she wants me out of her life as well? Do you trat ur family like this? Should I just not call her anymore?