This could be storyline, of course, but it could also be legitimate, from WWE.com:
Alexa Bliss suffered an injury to her left shoulder during her Raw Championship Match against Nia Jax at WWE Backlash. Bliss is currently awaiting further medical evaluation.
She did get thrown around a lot in what was a fairly physical match.
Bliss reportedly underwent minor surgery a couple weeks ago and didn’t miss any time because of it. She simply did some of the best skits that have aired on Monday Night Raw in some time with her “Moment of Bliss” schtick. So even if she’s legitimately injured, it may not mean missing time.
Then again, there isn’t much to go on here.
We’ll pass along any word that comes in.