Do I have to let my landlord enter anytime she wants to, & is it legal for her to bully me?

I rent a room. I haven't been home but I have been in contact with my landlord regularly. She entered my room without my permission & she also changed the lock on my door without telling me first or giving me a key. I attempted to get a key from her & she just keeps giving me the runaround instead. I have been telling her over & over that I do not want anyone in my room if I am not there. She is still telling me that she is going in my room today & any other day or time she feels like it. I have been trying to avoid confrontation with her but she is persistently messaging me telling me that she can & will be entering my room anytime she feels like it & I still do not have a key to the lock on my door to my room that she changed a month ago. The only thing she has been doing is harassing me via text & trying to bully me.