Valentine Lilina -spd + red

Congrats, you got the exact same Lilina that I got.

Gronnblade+
Reposition
Glimmer
Life and Death
G Tomebreaker (subject to change)
Cavalry Buff
Speed +3

That's how I'm most likely gonna build mine

OR, since she's +Res, you can do a ploy build.

Green Gift+ (+Res)
Reposition
Probably Iceberg
Death Blow 3/Fury 3 (Could go with Fortress Res for safe Ploy)
[Insert Ploy Here]
Def Ploy 3

29 Res with Res boon, +3 from weapon refine, +3 from Fury. She'd be sitting at 35 Res, not to mention Fortify Cavalry (if you're using her in Horse Emblem).

+red, Nice.