Skyward

I'm currently in 11th grade. I turned 18, but my mom won't sign my waivers for graduation, and the school won't let me remove her as a guardian so I can do it myself. I'm scared I won't graduate. I don't know what to do. They say I need a note from my mom, but she won't sign it. She got mad and started screaming and told me to tell my grandma to sign it. Then my grandma got mad. Any advice?

(im in florida)