Which F!Grima as base?

I'd say + ATK as it allows her to have more firepower, something she needs IMO as she lacks colour advantage.

Just my thoughts...
-R

Copy of the above.

-R

Sorry.. I first confused this with male Grima..
Her +spd iv seems to be popular but I personally use her +atk

+Atk/-HP is a stronger option to go for since she'll need every bit of damage she can inflict as she has no color advantage against any unit.

+Spd can be used if you're worried about her getting doubled a lot.

Either way, if you have a Hone Dragons user, F!Grima can make use of that and either boons will work out fine.