Well, if you are an adult, you have the right to decline her visitation to you. You don't have to let her in, but if you want to have a good relationship with her, its best to make up an excuse to why she cannot come.
How do I get rid of my controlling my mom when she is going to visit me?
Everybody loves to control somebody, your mother is no exception, just that she's going about it the wrong way. May be she means well and concerned then again it would be good to have a chat with her and let her know your view, also that you're capable of looking after your interest without creating any discontent?