total knee replacement is best solution if she cannot walk

Hello sir .as you say that your mother have osteoarthritis problem...plz start regular basis physiotherapy seasonso for your mother.and try to

Sounds like exercises won't be able to help much rather a surgery for knee replacement would be more beneficial

Osteoarthritis is a degenerative diseases , with age it get aggravate need a constant care to stop degeneration and to restore the mobility of the patient. start giving hot & cold pack contrast and then passive movements of the knee joint , you can take help of any good physiotherapist for batter advice on exercise part , you can give her glucosamine & Boswellia supplement . and take care of her weight if it is higher side you can start her weight loss so she can recover fast .