Board Thread:Off Topic/@comment-168.10.77.30-20170323172500/@comment-28288412-20170507094740

"Of course at the very end of the season we have a terrible loss, for Team JNPR. Um, Pyrrha Nikos is, is uh killed by Cinder" -Miles Luna.

Source: RWBY Volume 3 Blu Ray extra: No Heroes In The End.

Volume 3 Director's Commentary 2hrs 26mins 16secs in:

"I'm actually a little nervous because, I haven't seen her death. That I haven't... I'm a little scared." - Miles Luna.

In show context this was when Ozpin was opening the pod to let Pyrrha in it.

TLDR: She's dead.