You ask Loha for the keys, but she starts to panic. She tells you that she may have lost it. It looks like the Primitive Thief Boars nearby have the key, so it's up to you to defeat them all and retrieve it.
Apparently, Loha has the Storage Key that can open the safe where the Seal Stone of Ellin Forest is stored. You'd better head over to Altaire Camp and talk to Loha.