Then you lucked out honestly because nothing that I've tried (Haven't used the editor) has worked..Its part of the game, they scale with you.
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It happened to me too, but to Edelgard in Black Eagles. I can get her moving by using the max movement cheat, but her default movement is now 0. The only thing I did was use the editor to give myself maxed skill exp. Must be an unforseen issue. Oh well, rolling back to try again.