Review my build - Eirika (+Spd -HP)

I recently promoted my Eirika to 5 stars to give my +atk nino a use and gave her these skills. Here is a list of her skills and an explanation of why I chose them.

Weapon: Sieglinde - Self explanatory
Assist: Rally resistance - Helps her do what she does best. Support units and buff them. Rally resistance helps most mages as they mostly have good to really high res anyways. Great for blade tome users with glacies or iceberg.
Special: Aegis - This skill is a great help for her since she will need it to survive against mage units. This skill is better than lavish because she will rarely get attacked by melee units when used properly.
A slot: Fury - Great skill for her since she gets a boost in all stats without taking damage from any rare occasions where she needs to fight while also greatly increasing her survivability.
B slot: Swordbreaker - Since there aren’t many units with less than 36 speed, many units have the ability to counterattack her (especially Ryoma and Ike), this skill helps greatly as in the rare occasion where she does need to fight, she can use this skill to easily double any sword unit and deal actually good damage.
C slot: Hone speed - Basically the same reason as rally resistance. Able to buff nearby units and increase their speed for the turn. Also great for blade tome users.
Seal: Fortify defense - With this seal, she has the potential to buff a single unit in all 4 stats, making her a really good support unit. Not only great for blade tomes, but the boost In stats could negate bad IVs on a unit and make it easily broken. On a (whatever unit type) emblem team, she will be able to significantly increase their effectiveness, making units like Camilla and Caeda more than just wet noodles.

So that was my build for Eirika. This build is more defensive and focuses less on her high speed for offence and more on her amazing buffing abilities to maximise her effectiveness.