I am sorry to hear about your mother's stroke and her current condition. It is understandable that you want to find ways to help her regain her cognitive abilities. While there are no herbs or medicines that can cure the effects of stroke, there are different therapies that can help improve cognitive abilities.
Some of the therapies that can help improve cognitive abilities are speech therapy, occupational therapy, and cognitive rehabilitation. These therapies are designed to help stroke survivors regain their lost skills and independence. Speech therapy, for example, can help your mother improve her communication skills and ability to swallow. Occupational therapy, on the other hand, can help her regain her motor skills, such as dressing and cooking.
In terms of finding a hospital or facility that offers these therapies, you can try to search online or check with your local health department. You can also ask for a referral from your mother's neurologist or primary care physician.
It's important to keep in mind that recovery from a stroke can take time and patience. It's also important to work closely with your mother's healthcare team to understand her condition and the best approach to her care. I wish you and your family all the best.