Just to throw my 2 cents in. It took me about a year and a half before I finally could get an OB mini tampon in at 15. I heard about tampons from a girl friend in high school who was a competitive swimmer, I wanted to use them because pads were too uncomfortable but there wasn't an adult I could talk to. My mom found my first box of tampons and told me I would get seriously sick from using them, it was terrifying, frustrating and I didn't feel particularly inclined to talk to any adult about it because they were all so hush hush about matters like that.

So its really great you got your daughter an appointment to have someone who can discuss this sort of thing with her, its also great she can tell you about it. But this can sometimes take time. I would definitely suggest using OB tampons without the applicators and in mini size. Tampax and Playtex, I've found, tend to expand lengthwise which can become extremely uncomfortable. KY Jelly can help a little. But at the end of it, she might just have to keep trying. Good luck to her, I still remember how it felt back in those days and it was simply awful.