Mary had some serious skills.
With limited resources, she was apparently able to create highly effective eyeshadow and mascara. Naturally rich or not, she could have gotten even more wealth if she had begun her own business after returning home, selling all natural make-up.
While I'm on the subject, whoever had the biggest part in the making of everyone's clothing while they were stranded has some potential for success in the clothing design.
These are some skilled people.