You did the right thing. You don't owe anyone presents or gifts. A simple thank you is all the gift anyone needs.
Most sororities give gifts to the littles only, but there are a lot of sororities where it is traditional to give or make the big sister a gift as a thank you for being your sponsor.
I didn't love some of the gifts my "littles" gave to me over the years, but I certainly thanked them and was thrilled they took the time to think of me. I displayed those gifts and showed them off to the world during my collegiate years. I appreciated the time they put into those gifts and I loved being their "big."
Your big sister sounds like she is having some personal problems. Either that, or she is very rude. I wouldn't lose any sleep over it. Get out of the house if you need to, find another older sister to be a mentor to you, or do what you need to do. Or confront her and call her out on it. I wouldn't want to be friends with someone who was that rude and ungrateful to me without a heartfelt apology from her!
Good luck
