Let's see. Stats are alright.
Open, well you obviously only play it when really necessary or when opponent's units are healed. Of course you should take notice and not heal your damn opponent. Sigh but i think that was your own mistake healing the opponent.
But to be fair, open is garbage, since garfath takes a lot less effort to play for sure! Open needs to be changed to heal only your own units. I mean look at here she requires 3 gowen level sphere!
Startskill is such a huge backdraw that it alone prevents me from even considering playing her. I mean why should i buff perhaps something like a guardian or a dandan? And there is no way to stop it either unless you let her die, at which point i wonder why you played her anyway.
There is no way i will add crest devil knight to the deck just to make her worth it! That's already 3 sphere you need to manage and there are NO REASONABLE WAYS to get 3 spheres up for that combo!
In which case the opening is still horrible!
Anyway opening should be target enemy unit instead of random, then her openskill might not matter so much since you could just time it when the opponent can't profit from it! Or time it to counter a zu if you predict overdose.