What's she doing, exactly?

No idea, since she's no longer responding. Curious that the artist blurred out the error message and prompt.

I think maybe the user has no more use for the vocaloid so its being deleted.

She is in a trashcan, and artist is trying to delete her.

There is some poor shoopage here.

Idon't Know Its On Danbooru What Do you think That really might mean
?

Probably a "you cannot delete this because it is currently being used by another program" or something like that.

this makes me feel sad :'(