Can my Wife ski girls/juniors skis?

The only difference that I know between adult and junior skis are than juniors are most likely catered to beginners, offering more forgiveness. While this sounds enticing, I think that if your wife were to consistently ski in the future she may outgrow the ski in no time. I would suggest that you spend the extra money to get an entry level adult ski, which would provide a slightly less forgiving ride, but one she will be happy with for longer assuming she sticks with skiing. While the junior ski may be okay for her now, I'm not sure it's the best long term option. Also, I have heard that junior skis use "poorer quality materials" in production but I can't verify this at all. If it were true, then the skis might not last as long, but again I have no verification of this. Hope this helps.