These FVC and FEV1 results could indicate a mixed obstructive and restrictive lung problem. If your mom has smoked, these results could also indicate pure obstructive lung disease, such as chronic obstructive pulmonary disease (COPD). She needs to have a chest x-ray and additional pulmonary function testing to sort this out.
In either event, your mom does have decreased lung function. However she has enough lung function to live for many years, if not decades. Having a living will is always a good idea. In this instance it