Any tips to make my Florina better?

I really love Florina so I decided to try and build her with SI so she's actually good and this is what I came up with, I built her so she can wall mages and then oneshot them with a charged Iceberg and the extra damage from Swift Sparrow, while checking for fast sword units like Ayra and Mía and also being able to survive some blues and maybe a few slower greens, any suggestions to make her better and/or team options in and outside of Flier Emblem? Her IVs are +Res -Spd, I am F2P btw but feel free to suggest expensive stuff too.