For her tome it really just depends on what role you want her to play and what team she is one.
If you want her to excel primarily through the use of buffs then Gronnblade works very well since she can reach ridiculous stats through buffs
If you want her to eliminate the threat of bows against your team (priceless when on a flier team) then Gronnraven will work fantastically.
Gronnowl works well on any team provided, as we all know, you surround her with allies.
I personally like her tome. While it is a tad lackluster it does heal her after a battle and it can undergo refinement, so you can make her even stronger.
I could see close counter working. She meets the 30 defense threshold so she has some sort of survivability against physical units.
I can't really offer any more advice in terms of her B or C slots as I am still working on those, but I'd recommend her special to be either Bonfire or Ignis (whichever appeals to the tempo of your playstyle) as her defense is high enough to contribute to effective burst damage.
Good luck man!
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