How big is the area?
How long has she had it?
Does it itch or get red or painful?
It is pretty tiny, about the size of these dashes --. She says she's had it a "long time" but honestly I didn't notice it until about a month ago. No, it never itches or gets read or painful.
I think that is reassuring then, if it continues to get larger than you may want a dermatologist to look at it but it does not sound like anything concerning at this time.
It is important to monitor moles or changes in skin coloring.