You’re not being unreasonable at all! I can’t bare it when family think they’re entitled to have 1:1 time with young children/babies! It’s a flat no, if you have a single doubt about it, go with your gut! Your husband will need to have that conversation with her as that’s probs the best way to not have it damage your relationship? You don’t need extra stress especially if it’s making you feel so anxious. Just take a deep breath and calm yourself when you feel worked up. I’ve made rash/harsh decisions and comments when I’ve been worked up in the moment over the children and it’s hard to come back from!x
Go with your gut. Dont be pushed into doing something you don’t want to do, especially when it comes to the health and safety of your baby. If you don’t stand your ground and God forbid anything happens to your baby whilst in the care of your MIL, you’ll regret not listening to your instincts. As lovely as my MIL is, I unfortunately can’t trust her with my daughter alone, as much as I would love to. My MIL bangs on about so many things that I disagree with, like saying i should give my daughter biscuits and tea (this was at 4 months). However I had no reason to suspect my MIL would go against my words at the time. My daughter was 100% fine then one day i left her with my MIL for a couple hours. My daughter has had major gut issues since (including a trip to the hospital). Could just be an unfortunate coincidence but Ive never left her with her since.
Your feelings are completely valid and do not be guilt tripped or bullied into doing anything you don’t want to do. I’m sorry you’re having to deal with this, it’s the last thing you want