I can't believe my mom would do this to me

Julie
My mom has always been there and supportive. She has struggled with depression the past few years but I never thought it would lead to her breaking a promise. She's never done that to me. 
I've been asking her all week to go look st baby stuff with me. We planned on Wednesday but she didn't feel well so she promised we'd go today - she calls this morning and bails again saying she doesn't feel well - even after promising. 
I just feel so hurt my own mother doesn't seem interested in my pregnancy. I'm 24 weeks and all she's done is sit in for 1 or 2 prenatal appointments which were like a whole 5-10 minutes. I am so devastated and upset she would bail on me twice.  And she's mad st me for telling my sister she bailed on me. I guess I'm just venting on here. 
My poor baby has been kicking me like crazy I guess he knows I'm upset cuz I've been yelling and crying for an hour. Trying to destress because I know it's not good for pregnancy