Turn your wheelchair into a chopper. Just strap on an electric motor, and you’re off to the races!
According to their site, “Firefly™ – Go Twice as Fast! The Firefly is an electric https://diazepamhome.com handcycle that snaps on to your wheelchair. Go twice as fast and twice as far as a power wheelchair!”
Grandma must have been going pretty fast if this only doubles her speed!