Don't know, looks like blood and it doesn't looks like someone else blood because otherwise Pains reaction wold give this fact away, like a surprise reaction or looking to the side. But, after two days of close examination on the whole scene after the shinra tensei scene, I discovered something that perhaps is a sign that she's still alive, however, I'm not pretty sure to post it here. Let's wait the next issue. For now, consider that everything linked to her death is being hidden too much for me to take a final decision.
Again, I could be wrong.
Peace.