I am not sure how to interpret the pronoun in this one:
Ей вы́слали приглаше́ние, но она́ не пришла́.
Obviously the second "she" is in nominative, but what about the first one?
Looking at the declension alone it could be either dative or instrumental.
I can see arguments for both: dative because 'she' could answer the 'to whom/what' of the verb 'sent'. Instrumental because 'she' could be the 2nd direct object alongside the invitation. I also considered instrumental via the logical subject route but since the phrase does not mention one who could function as the sender, I doubt she becomes the logical subject by default.
Is there some other rule that I do not know about? Perhaps it has to do with the 2nd 'she'?