How do I navigate this?

so about 2 weeks ago, me and my mom planned to do my hair (put in faux locs) on August 13 (today) as i’m leaving for college on the 17th. the 13th comes and she’s MIA for most of the morning (she didn't tell anyone where she was going, even though we planned to do it in the morning) by the time she reappeared it’s after 3 and she has to cook dinner for my older sister had come from out of state for the day. mom tells me that’s she’ll start my hair after she’s done cooking (mind you my hair is already washed and ready for her to start). well 6 rolls around and my dad leaves to take my sister to the airport and my mom leaves to take my other sister back to her apartment. she says she’ll be right back but hours go by (my sister live 5 minutes away). she then call me at 8 to ask me a question but doesn’t come home. at this point it’s 10 and i’m getting ready for bed when she walks in smiling like nothings wrong. the first thing i say is “i really don’t appreciate when we make plans to do something and you completely disregard them” she starts making excuses like we can start now (this is not the first time she’s disregarded me). i get upset and of course she tells me to stop yelling at her but i haven’t even rose my voice. eventually, i don’t that it’s not ok that she’s does that. which ends up having her say “we’ll that’s how i feel when you guys don’t do what i say”. how does that equate to what’s she’s done? i don’t understand. it gives me such anxiety when i plan something and people completely disregard the plan. what’s the point of the plan? what am i supposed to do?
How do I navigate this?
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