MIL blaming me for my husband not having visitors during his healing process after surgery

My husband ended up in the ER a couple days ago. He has a tumor on his lung that he has needed to get surgically removed and he kept "forgetting" to schedule the surgery. My husband does not like the idea of going under anesthesia because he got taken advantage of by a family member in the hospital when he was 17 and still coming off the anesthesia. So he has this really bad phobia of being put under. He kept putting it off and I had a C-section not too long ago and was worried about everything. He went to the ER because he was coughing up a lot of blood. He's been admitted to the hospital and he's getting this surgery Monday. To make him comfortable I promised him there would be absolutely NO visitors while he's recovering. He's been shaken about the whole thing. He has decided he wants at least 24 hours of being out of surgery before anyone besides me comes into his hospital room. This gives time for the anesthesia to wear off and his anxieties of hopefully calm down. He's already being monitored because his blood pressure is so high some anxiety. His mom wanted to be at the hospital when he gets out of surgery and I did ask my husband was his mom and exception and he just yelled he wants to be alone. He doesn't want anyone else there. I told his mom and she's blaming me. We didn't let her in the room after I had the baby so she thinks this is me doing this. She knows very well why he feels the way he does but she said she's his mother and obviously would never do anything to him. She says I took away time with her new grandchild and now I'm trying to keep her away from her son. And I'm the one having to deal with my MILs attitude because my husband is having mental breakdowns in the hospital. Just feels like I can't do anything right for this lady.