Relationships with siblings can be very trying.
I find I do better if/when I don't expect siblings to "change" and also realize my relationships with them may have some limitations. I do have an open mind, incase someone does grow and wants a better relationship with me.
I used to get disappointed by expecting too much from siblings, while they were still going through their "sibling rivalry" stuff.

Rivalry issues really came to the surface even more once H and I invited my mom to live with us! Wow! We were shunned for about 7 years. Lol. Insanity. We could have used some assistance. My mother accepting our help never meant her feelings had changed for each of them/all of us.
I hope your sister matures and you can have a healthy relationship with her someday. As parents age, relationships with siblings can become more important sometimes.
Do whatever is best for you.

WC