I'm going to tell my grandma to stop
What do you want your grandmother to stop doing?
I want her to stop complaining to me about my lifestyle
I think it is alright to ask others to stop doing something you find uncomfortable. Just be polite about it and don't make a huge deal, and you should be fine.
whatever. I'm going to make a huge deal.
Well I don't think you need to make it a huge deal, just tell her in private to mind her own business.