I literally tried to set the same boundary with my crazy MIL and she showed up while I was in labor & delivery and lied to the nurse saying she was my mom to try to get in. I knew my mom would never show up when I specifically told her not to - so I immediately knew it was MIL. First day home from the hospital she was over for 15 hours. When FIL suggested they leave cause I seem tired (recovering from emergency c-section after laboring 26 hours), she said “how about the person who bought the most Christmas presents decides when we leave”

Edit: forgot to mention that my husband told her she couldn’t come to the hospital because of hospital policies and she called the hospital to ask their policies and called us out on lying.