Irritating MIL

So I'm scheduled for a repeat c-section mid January w/ my 2nd. My husband talked about this early on that we didn't want visitors at the hospital for a few reasons. 1. We want our son (he'll be 17 months) to be the first to meet his brother or sister. I think it would be unfair to have him come see us, and then have to leave..he won't understand and I don't want to put him through that. 2. It's a two night policy for our hospital for Caesarian deliveries so I think two nights with just the baby and my husband isn't unreasonable.

Now I mentioned this to my MIL since her and my FIL will be watching my son while we are in the hospital..she did not like this idea at all and tried to use my son as an excuse like "he's really going to want to see you guys though"

Mind you the first c Section was tough because it was an emergency and I caved and let family come visit when I initially didn't want it. It was the 2nd full day that we were there that my MIL wanted to come see the baby AGAIN and we said no because I really wasn't feeling well...she showed up anyway!!! Wouldn't leave for hrs, kept hovering over the nurses and doctors, I just wanted to scream at her.. and it got worse from there since they were at the house every day the first week I was home! The second she walked through the door it was "ok gimme the baby" and she would ignore me if the baby started fussing and I wanted him back. I had to leave the room and go upstairs and bawl my eyes out because I was so overwhelmed..it's something I never fully got over and I really want to avoid that this time.

So talking to her about giving us a few days (like 3-4) to ourselves once we're home is going to be a tough conversation to have just because she doesn't listen... if anyone has dealt with this before, I would really appreciate some advice. I don't want to cause problems but she also really stressed me out the first time and I'm afraid I'll snap if she does the same thing again.