Boots: Depends on what your shop has in stock since she has to try them. Selection for woman's are rather small in shops (my experience... I'm lucky, if I have 3 models to choose from
) Take the ones she's most comfortable with.
Im very happy with my K2 Contour, love their double BOA system cause you can adjust the inner and outer boot on the fly. Can't help with boards. For sizes try SnowLifts.com - Snowboard Size Length Calculator