I wanna give this a shot and attempt to work out her stats so bear with me.

Firstly, both the Green Axe Flier and the Valter faced are from Valter's Hard GHB:

BST: 157 - Gen 2 Cavalry BST.

HP: 38 - Straight from the video

Attack: 31 - Against Valter who has the weapon triangle advantage and 26 def, Eirika does 19 damage. Assuming Atk Spd Solo is active, this is (atk x 0.8) - 26= 19, (atk x 0.8) = 45, atk = 45/0.8 = 56 attack, subtract 19 and 6 from 56 bringing her to 31 attack

Speed: Minimum of 33 speed - No way of knowing Eirika's true speed since she doubles both Valter and the Green flier who have 26 and 28 speed respectively. Eirika is known for being fast so I am expecting between 36-40 speed.

Def: 27 - Similarly against Valter who has WTA and 43 atk in his particular map and deals 15 damage, (43 x 1.2) -15 is 36 def, subtract 3 from her weapons effect brings Eirika to 33 def, and assuming Odd Def Wave is not active, will bring her to 27 defence.

Res: Unknown from trailer - Given that Eirika has 157 BST and using her HP, Atk, Def calculations and my speed prediction, I expect between 20 and 24 resistance.

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Stat Prediction: 38/31/36 Min/27/24 Max