-atk is unfortunate but as long as she's not -spd she's still very good.
I'm gearing up to give mine Odin's tome, which is honestly probably overkill for a unit that already murders everything. But it would offset -atk and then some. Only problem is it's a TON of SP, but mine's already almost back up to 1000 SP saved. Either way, I'll be promoting Olivia and/or Sharena first so it's a ways off.
I already run Fury and Desperation, with Moonbow. I keep Fortify Res on her to help with Hector and Lucina's bad resistance. I leave Ardent Sacrifice on to help her get into Desperation range and top off Hector here and there.
So I've been trying to find a good build for my +Attack/-def Linde, and after playing with the mass duel sim, I found that as long as you attach an Erika buff battery (+3 Attack, + 4 speed) to Linde, with the Barblade + and the Attack + 1 S Skill, she'll do the same amount of work with Speed+3 as she would with Fury 3. At the same time, at that point Desperation only secures her 1 more kill (Fae). Looking at that, I figured it isn't really worth grabbing on her, since you will want Barblade + on her, and will want Erika as her battery if possible.If you don't give her Barblade+, Aura falls short without Fury 3 though (and even then, is still back 4 kills).
For other possible skills, Life and Death 3 = Swift Sparrow for the best A skill, and your B skill literally doesn't matter, since Linde either kills or is killed by this point. With 2 attacks, the only units she can't kill from full health are F Robin and Hector, thanks to B Tomebreaker and Hector 1-shotting her with distant Counter. Her build also holds up well when everyone has Fury 3, which is nice.
Just felt like sharing what I found. It only applies to +Attack/~Speed Linde, since my checks with neutral Attack and -Speed didn't work out as well (you want Fury for that attack + speed). My findings for Lucina are somewhat similar, since she gains the most with +Speed when she is +attack, so 53 attack may be some kind of "soft cap" on the stat.