sick of "being pushed around".. right.

i need to get groceries and my mom keeps saying that she'll bring me "later" which to me means "never" because i believe she said the same thing to me the last time i came to her place and she ended up getting them herself and she forgot some things, i bet the seme thing will happen this weekend.
she wasn't telling me this but she had an appointment to get a tattoo (a stupid time to schedule an appointment: when you know it's the same weekend your daughter is coming to your place for the weekend). my sister figured it out, that's why she kept saying "later" for the grocery store. so my sister ended up making her cancel the appointment and cry, saying that she was sick of "being pushed around", well.. if she's so sick of being pushed around, she wouldn't have cancelled the appointment.