Sister is mad i want to get married same year

If her concerns are on financial stuff, let her know that she does not have to be involved in situations that cost her money, except perhaps to attend the wedding event. Instead of adding expenses to her, tell her you are happy just having her as a sister and that she too is getting married. It is natural that people close to an engaged couple also get interested in marriage. If you also keep the bachelorette as a simple and cheap gathering, there is nothing to complain about that situation. Others here will note that a bride only gets her day, not the week before or after, and especially not the whole year.

The idea here is that if it is easy and simple to address her concerns, your sister should be satisfied.

Your sister sounds very involved in her own needs. She gets one day. One. The ring on her finger doesn't entitle her to a whole year. As Michael has said, reassure her that you're not expecting for her to spend money on you or your day, and that you're happy if she is in attendance to support you in whatever capacity. Then don't get drawn into conflict after that. "We're choosing what works best for us and our marriage" is a line you could say. No-one can argue with that.

It is too bad that these dynamics happen. Sometimes sisters and friends try to out do each other (or it is lopsided). There have been several of those situations posted around here (but they still are rare). However, your concern regarding your grandmother is reasonable enough, especially with a sister claiming the whole year. I hope things smooth out between you.