I wouldn’t say anything to her like “you’re in the kitchen too much”, just start letting her know ahead of time that ur gonna be using it. Like, “hey I’m gonna be cooking tonight for a few hours, heads up! I don’t want us to be tripping over each other” And if she doesn’t leave it empty for you, start cooking right around her even if it’s uncomfortable. sometimes just taking up space confidently sends a message ykwim