"I suppose that depends on what you think a mortal is." She ages, she'll probably die. Or at least lose her corporeal body. Things that have happened or might happen in the future are complicated where she comes from.

Whatever the case, it appears she's not the sort of person of her caliber and appearance that Gadriel is used to dealing with.

"Have you eaten, Gadriel? Or do you need to eat, given you're suggesting that you're not mortal."