HELP MIL ISSUES!

So my spouse and I told the MIL our plan. You can see baby at the hospital but 2-4 weeks after we're off limits. We have your phone number if we need anything but that's what we want. My mom has a psych background and is allowed to come in to make 2x/week "wellness" mommy checks because I am at high risk for PPD. But that's it. MIL then came back with I don't know if I can stay away for that long. My point is: It's not your choice! This is what's going to happen I don't want to lose my sh*t but she's known for being very pushy and if she doesnt get her way she'll just show up. She's done it for way less than a grandkid, it's been over mail. I need advice because if it happens and I don't call her over and she just shows up unannounced I'm going to lose my cool and go off on her.