I noticed that, too, with Leonie. Her other supports that I have seen have little to do with her Jeralt worship. There's quite a bit to the character that I really like, actually. She's a bit stingy, but she also isn't wasteful when it comes to using things (in the supports, I mean).
In terms of gameplay, she's tailor made for being a Bow Knight, but that's fine with me, since bows are really useful in this game.