Why would a young, healthy women let visible beard hairs grow, instead of plucking them?

Last week, I saw my niece. She is about 35 years old, married, with 4 children. She never was one to use make-up, dye her hair or manage her weight, but she has a desk job and does keep her hygiene and dresses appropriately. When we met, she had quite some visible, thick, black beard hairs. She could not have missed them, they where very distinct. I know this is not abnormal to occur with women and off course she is entitled to let them grow and I didn't mention anything to her, that is not up to me, I think. But I just can not understand why any normal, mentally healthy, happy young women would want that. Is it possible that she just doesn't care? For me, it feels like lack of self respect. Oh well, I just don't understand. Does anyone?