I Need Advice Choosing Recliner For COPD Patient

My Mom needs a good DURABLE recliner as she not only sits in it during the day, she sleeps in it at night! We simply can not afford a high-end chair. We have to stay under $600. We are not looking for leather or such. She actually prefers fabric upholstery, such as the microfiber. Also, we are not expecting "champagne on a beer budget". But hopefully, someone here can recommend either particular brands or models or tell me what to avoid and what to look for when checking a recliner out. There must be some questions to ask the salesperson that will help us choose.
If we could afford to buy her a new chair every couple of years, I wouldn't worry so much, but unfortunately, this is not the case. She is ailing, so please, if you can, any guidance would be appreciated.