Can draw well on skin but not on paper.

Hey, so my teenage daughter wants to be a tattoo artist so I've been signing her up for art classes. She tells me she can't draw well on paper and only does well on skin. She has also done some practice with a cheap tattoo gun on synthetic skin and does well with that too. I've always though she would need to have both skills to be a great tattoo artist. Should I keep pushing her to improve her drawing skills on paper in preparation for becoming a tattoo artist?