Regarding sides for a woman, they include: a deepening of the voice; clitoral enlargement, in the extreme cases it can become more of a micro-penis; increased hair growth. These are irreversible. On top of those, there are the usual ones that we're all familiar with: liver damage; kidney damage; cardio-vascular disease; abcesses. I'm not sure where women stand with regard to accelerated hair loss.
For advice on female steroid use, you'd be better to post in the women's forum. Most likely, though, their best suggestions will be to tell the girl to do her own posting and research.