Folding lightweight wheelchair (mitcham CR4)

Hello,
I am desperately looking for a folding 15lb lightweight wheelchair for my elderly mother who had a fall and broke her femor bone. It is very isolating and lonely stuck up in the house. I would love to take her out and about in a lightweight wheelchair which is easy for me to load in the car and push.
I can pick up locally near Mitcham, Wimbledon, Morden, Wandsworth, Sutton, Carshalton, Hackbridge and nearby Croydon.
Thank you.