Help! My wheelchair is being taken from me!

I am a 22yo who lives alone and is still on my parents insurance. Because of this, they have some control over my medical issues. Yesterday, my mother told me that she does not see how I need a wheelchair regardless of the fact that I have had three doctors sign off on my paperwork for it. She threatened to call our insurance company yesterday and cancel the custom wheelchair order because she is angry at something I have done and she is using this to punish me. My current chair is a loaner for insurance so once she cancels, this one will be taken back as well and I will be chair-less. I can’t work or function without a chair. I will be trapped in my home, unable to do much other than lay in bed. Does anyone have any advice? I’m panicking