According to WWE, she suffered a “broken face and severe concussion.” From WWE.com:
SmackDown Women’s Champion Becky Lynch sustained a broken face and severe concussion during last night’s SmackDown LIVE Women’s division invasion of Monday Night Raw, WWE.com can confirm.
As a result, Lynch will no longer be facing Raw Women’s Champion Ronda Rousey this Sunday at Survivor Series.
On SmackDown, the commentary team announced the injury at the beginning of the show and said that a replacement opponent for Ronda Rousey would be named later tonight.
The injury happened at the hands of Nia Jax, who slugged Lynch in the face inexplicably hard, busting her open during last night’s SmackDown invasion of Raw. WWE showed slow motion replays on SmackDown, which you can see below.
— TDE Wrestling (@totaldivaseps) November 14, 2018
On SmackDown, Becky Lynch came out, sporting a black eye, and said that she was angry that she couldn’t be medically cleared, and was angry that she couldn’t finish what she started with Ronda Rousey… “yet.” She then picked Charlotte Flair as her replacement against Rousey at Survivor Series, told Charlotte to make Rousey tap, and the two hugged each other.
Becky made it seem like she was really hopeful that she would still be able to wrestle at Survivor Series and there was no indication that she would have to drop the title at any point, so that could mean that the injury hopefully won’t cause her to miss too much time, despite how bad “broken face and severe concussion” sound.