Unwanted visitors

My husband and I have a 6 month old baby and it’s our first. My husband works Monday-Friday until 5.30 so i’m home all day alone with baby.

Theres nothing that annoys me more than unwanted and unannounced visitors! My MIL just turns up at random times completely unannounced and it drives me crazy! When i’m trying to get the baby down for a nap and all of a sudden there she is banging on the door, wakes the baby up and ruins any progress made in trying to get her settled.

One time I had a couple of close friends visiting who I don’t get to see often as they live over 5 hours away by car. Surprise surprise, MIL turns up and barges her way in as soon as the door is opened.

Before the baby was born my husband and I both said to everyone multiple times, we are happy with people visiting but please send us a message or give us a call before so we know to expect it.

Not once has my MIL respected this, every single time she turns up I tell her to let me know first, but no.

The last two times she turned up unannounced I wasn’t in, she then sent me a message hours later making snide comments that she came to visit but I wasn’t there. I told her again that if she had let me know in advance then I could have made sure I was at home! But once again, she didn’t listen.

How do I handle this situation with her? I’m tempted to just ignore it when someone knocks on the door! Any advice would be greatly appreciated!