mom rescheduled my first day and i'm worried (USA) Texas

My mom drives me from work as I'm only 16 and don't have a license or a car. I told her I need to be there at 11am tomorrow, she knew that BEFORE starting work today, and she can't take me because she's at work. My father can't take me either because we only have 1 car. She didn't reschedule her work or anything, now she's making me reschedule mine, on my first fucking day. I know she has a job but I'm pissed that she does this, she could've rescheduled her work for later or something, it's my first day and I don't want to look bad, she called them and told them I won't be able to make it until an hour and a half later, they asked "Is this going to be a regular occuring thing" Probably the worst thing they could say. I'm just pissed, I know it's mcdonalds, but it's my first job and my first day, and she just ruins it like always.