From what you've said, I just don't see how it's going to be logistically or financially possible for you to do allstar this year. But I also believe in the importance of having a distraction, doing something you love despite whatever is going on in your life. Hence why I do a boatload of co-curriculars despite the stresses of study and exams.
So do high school cheer, take some casual tumbling or stunting classes and work your way up to doing allstar next year. Your mom may not say it, but she'll probably be grateful to have more time with you and not have to worry so much about money.