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Well, one could also interpret the "Lay of Leithian" that Thuringwethil wore some kind of elaborate flying apparatus that Luthien then took off her and used for herself ... that would be a somewhat technical explanation but one that would fit with what we know about Arda. The description of the "garb" ("iron nails") seems to point in that direction. Luthien can't change or "transform" (as you put it) her form/hroa no matter how powerful she is, it is not in her nature. So she either took Thuringwethils flying apparatus OR she skinned Thuringwethil and wore her fur. How she would be able to fly while wearing a fur with wings is a bit less believable, but maybe she worked some kind of spell, that would certainly be in her power.
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