Does my mother have body dismorphic disorder?

No matter what the age you are (and 50's is not old!), to have true happiness in life, you have to be happy with yourself. Some people are a little more vain than others, while other people are content without making any drastic cosmetic or weight changes. She is the way she is - you can't change her unless she wants to change. She may have an obsession about how she looks but as long as she's not starving herself or purging I would be proud that she feels good about herself. Good luck and God Bless.