What to do with a +atk-spd summer tana?

Her speed increases by 3 just by having Fruit of Iðunn equipped, and her Atk/Spd Push gives her more speed when she has 100% HP.

She's one of those units where a bane in spd is not as detrimental compared to others. If anything, preserving her bulk comes in handy when she needs to take a hit or two. With renewal, she has no trouble with sustain either.

Her base kit already covers her Spd loss pretty much, but you could invest more into a one-shot blade tome kit. However, at that point you could use those feathers somewhere else. Especially if you don't have hone flier buffs.