I very much agree with the posters that said nurse on demand and research shots and don't get any more until YOU are sure you want to.
I nursed on demand, and my ds is a perfectly normal weight.
I didn't know anything about vaccines, and didn't do any research until ds was 1 year old. He had been vax'ed on schedule until then. At that point, I stopped vaxes because he was most likely already as immune as he was going to be with more doses. (this is according to information from the CDC).
You can delay, choose which ones you want, space them out the way you want, etc. You can also email me if you want links to sources.
I strongly disagree that babies that age will cry because "what crying will do for her." At that age (and up to about 1year or older, imo) any "want" is a need. That need might just be that she needs to be held. It might be that she needs comforting (which could be why she stopped crying when you nursed). But it's a genuine need.
My ds only ever slept on me. He did a lot of comfort nursing. It's normal, and fine as long as your needs are being met too.