Get Bella a Bike

Hi My Name is Bella. I am 10 years old and I have a rare metabolic condition which causes a physical impairment (I'm in a wheelchair), epilepsy, intellectual impairment and global developmental delay. I love being independent and my greatest wish is to have my very own bike :) so I can ride with my sisters. But the type of bike I need is really expensive :( Please help me get my bike so I can ride with my sisters.