Here's hoping you're right, so far I haven't found much use to them. The healing can be nice, but it comes at a cost of having a character who can't pull any weight in the dealing damage front and has to be protected from almost everything, which I've found a little too taxing when you take into account that there are only 4 units and a really small map.
Healing not scaling isn't also very good, right now. 18 might seem like much early on, but when you reach Lunatic and stuff and all charas are nearing 30 HP (and more for most of them), doing 18 every other turn when that's likely less than what most people are gonna be hitting for... eh.
But well, she's gonna stay here, nothing else I can do with her other than wait and see if it eventually pays off, lol.