It sounds like this is not a tenancy at all but a liferent. The reason I say that is because this was set up in a will by the deceased owner. A liferent is a right to live in a property or to occupy land for the duration of your life. The liferent is occupied by what is called the liferenter. The ownership of the property is that of the fiar, generally the beneficiary under the will. So you have liferent and fee. The fiar has no obligation to maintain the property. But he has no right to occupy it until the liferenter dies or renounces the liferent. The liferenter has the right to live there until death or otherwise to enjoy the "fruits of the property" such as the rents for example. The liferenter is responsible for the upkeep. The fiar is not. There is no right to buy. If the liferenter wants to but there would have to be an agreement with the fiar. However, he can't throw his weight about as the liferenter has an absolute right of occupation until death. That is not a right of tenancy. It is an absolute right of occupation. Happy to discuss further. I hope that helps. Please leave a positive rating so that I am credited for my time.
No she doesn't as its a private tenancy and there is no right to buy.