Help! MIL!

I'm 20 weeks pregnant after 2 years of infertility and one miscarriage. Since she found out, my MIL has been calling me non-stop to check in, and also letting LOTS of judgemental comments drop about how much harder she had it, and how much she struggled, when she was pregnant and how her husband (FIL) wasn't as good to her as mine has been to me (her son). She's also insisted on the name for the baby, and has been way over enthusiastic to a point of being overwhelming. I've tolerated it and been friendly because I understand that this is her first grandchild (and her only shot at one at the moment), so I don't wanna take that away from her or hurt her feelings. I tend to have so much anxiety with her that I've never had the guts to stand up for myself with her. My husband also adores her and I adore him and am willing to keep things civil and friendly with my MIL for his sake. But yesterday she called and told me (she didn't "ask"), that she's planning to take time off when the baby is born so she can spend some time with me. I've had previous uterine surgery and I will have a scheduled c-section. I'm afraid she will just take the time off and expect to be in my home constantly and I will be overwhelmed as a new mom dealing with surgical recovery, new baby, breastfeeding, etc. Has anyone else dealt with this? I'd love to handle it tactfully, so any advice would be very much appreciated.