Shouldn't be difficult to pick up, then. She'll probably have enough down within the day to sound merely like a mediocre second-language speaker and not someone trying to Frankenstein sentences out of linguistic scrap. For now, though, she'll have to work at it.
So she has a decision to make here. She can admit to Dragon Fairy Elf Witch, which might dispel some of the concerns about her foxy nature—by their reactions she guessed right that is a concern, though they seem to be on good terms with the fox girl specifically, perhaps—but it also might tick off the fox that Rebecca copied her. Her impression from home of fox spirits (ascended foxes?) is that they can be capricious and prideful, and she essentially stole their heritage.
But keeping her mouth shut is a worse idea. She doesn't know how to act right, and she's not going to stop Dragon Fairy Elf Witching things, so it'll come out eventually. And for the fox spirit, Rebecca is reasonably sure she can take the girl in a fight, and she thinks the girl believes it, so even if they can't smooth it over, it's not a huge disaster. And hiding it and having it come out later would make the girl more mad, even if she wouldn't have been inclined to it orignally.
So she says, "My condolences for your son and his wife, and I hope that they recover. I only recently arrived in this land, so if your people would host me for some time and explain the land and its ways and people for me, I will consider that ample reward."
A pause.
"I do not know the other <ascended> fox, though I commend her for her valor. I am not originally an <ascended> fox, but <shapeshifted> into the form because I saw the other <ascended> fox was able to <resist/repel> the cracks." She points at one of the still-open rifts. "The cracks are new to me, but I can assist in closing them now." She thinks.
(She's using a version of the word "shapeshift" that, in the Chinese she knows, has a slight but not definitive connotation of a higher being taking a lower form to act among mortals.)