Are my expectations too high?

Here's the story. So I'm 30. Married, homeowner, just had my first baby in January. My mom lives with me. My parents divorced when I was 2. Mostly due to a difference in thinking in regards to finances. She's not what I would call financially responsible. She was supposed to pay rent. She doesn't. She was supposed to watch my son while I was at work 2 days a week. She doesn't. She works at a grocery store, anytime we ask her to bring something home she conveniently doesn't have money or forgets her debit card. I take medication for depression. I have major depressive disorder with suicidal ideation, anxiety, trichotillomania, dermatillomania, and mild OCD. Mixed with PPD and new mother anxiety. I just went out of work on disability because I'm really struggling lately. Add to that, 6 month sleep regression. I don't shower. I don't sleep. I'm in a bad spot. (Don't worry, my son is clean and fed and in no danger whatsoever, he is the reason I wake up everyday and while I can't/don't take care of myself he is well taken care of. He's the reason I'm breathing and typing this right now) My mother knows I'm struggling. She comes home from work, eats dinner, showers, and sleeps at her boyfriends probably 4/5 nights a week. Yesterday I couldn't get the baby to sleep all day. She had off today and needed to be home because we have family visiting from out of town for lunch. Last night she ate dinner, and went to her boyfriends. I had to go to the store for a few things this morning. Our family was coming for lunch around noon. My son didn't sleep last night. So at 8am she starts texting me that she won't be home till 11am. Mind you, she's not doing anything, she's off and she's just hanging out at her boyfriends. So now I have to take my miserable tired 6 month old (and self) to the store with me to get what I needed for lunch today. Great. I wanna strangle her. I understand he's my child. I understand she has a life. I don't understand how she could live here, for free, not help with anything, come and go as she pleases, and not feel even a little guilty. Honestly, I don't think I'm asking too much. Let me take a nap. Or run an errand. I'm not asking her to stay up all night with the baby. Are my expectations too high?

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