She was told that she wouldn't be selected for the relay or the Antholz races and retired from Biathlon one day later.Federica Sanfilippo has been forced out of the biathlon team (in Wierer's words), so that explains why she's been active on the XC circuit recently.
Since Wierer has been considering retirement for a while, this could possibly mean that the decision to stop before the Antholz Olympics gets a little easier for her to make.
It sounds harsh annd I feel for her, but at the same time Passler did really well in the relay and they probably want to give Auchentaller a chance at her home WC after her good results and first season win in the IBU cup.