Being a big girl, she should have no problem on a men's board in the future. However, for a first board and a beginner skill level, an appropriately sized women's board is probably a better idea because of the more forgiving flex and will be easier to turn and lighter.
18 Snoplanks Asym Fish . 18 Arbor Terrapin . 17 NS Maverix . 17 NS Twenty Five . 16 NS Swift - 14 TJ Brand Retro Fish
18 Rome Katana . 17 Burton Malavita Wing . 16 Burton Genesis X
16 Flow Talon