My MIL is driving me crazy.

Summer
My mother in law is doll, really I adore her but she doesn't seem to grasp that she is actually not my mother. My husband is an only child and she basically took care of him until I he moved in with me. She is a very caring person, but doesn't seem to take no for an answer. She wants to help all the time and volunteers to do things and expects me to rely on her and then I relied on her to help me at my baby shower and she didn't even show up or come at all. -.- so she wants to watch her grand daughter when i go back to work & my mom is going to watch her M-Thursdays and she can watch the baby F-Sunday. Husband and I work retail so our scheduale is never set. However I would prefer to have my mother watch her full time because my mom has an entire nursery set up. My mom is single and doesn't work and has all the time in the world and my mom taught me everything I know about babies l know my baby will be taken care of how I myself would take care of her. My mother law works M-W and also takes care of her MIL and makes dinner for her husband everyday. This alone stresses her out and she often complains about never having any time to herself. I feel weird giving her my child for yet another thing she has to do. She has nothing for the baby. Not even a pack and play/ and she lives out of the way... Now she is trying to tell me she wants to be in the delivery room and is trying to butter me up by taking over my birthday to get me to say yes! Help!! I'm very private and I'm very independent, my husband thinks I'm being rude because I don't want to see my MIL on MY birthday! 😒😒 & I don't want her there while I'm in labor. Idk what to do.