Help! dont want to get kicked off the teammm?

i am a cheerleader and my coach for cheer is very strict with attendance and i have previously missed a couple of the things due to school related activities which didnt bother her but now my moms makin me go on this trip and i would have to miss two more practices and im scared shes going to kick me off the team or take away my position of being a flyer.. what can i do?:/