Laurel and Dahlia are always down for friends.

Also, I believe she is of an age with Marie-Louise Prewett (Malou) and possibly Shalott Dempsey (Lottie). The latter was a Ravenclaw too (although you've got Ravenclaw and Hufflepuff listed in two different locations). Lottie would be the more likely choice for a friend as she had tons of friends in school and Malou was a shy Slytherin.