Did you switch to the high poly head after you loaded the preset, and THEN import her face? Do it in that order, and it should be fine. Load preset, switch to high poly head, import face.
She does not, but you can always use this mod for armor that adds a tail: https://www.nexusmods.com/skyrimspecialedition/mods/83155 This one also adds a tail: https://www.nexusmods.com/skyrimspecialedition/mods/17906
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This one also adds a tail: https://www.nexusmods.com/skyrimspecialedition/mods/17906