I happen to have an Elincia at the same ivs. The way i made her work is I built her like a quad unit (aka L&D 3 and Desperation 3) She reaches a sky high 42 speed. And even with atk- her attack is still a very viable 47. If you plan on using her on a flier team the atk- won't even matter. It's all gotta do with how you intend on using her, and what you have available.