On the most recent edition of Wrestling Observer Radio, Dave Meltzer noted that WWE Diva Lana is actually a very talented wrestler, but an undisclosed medical reason is rumored to be preventing WWE from clearing her to wrestle actual matches and take bumps.
Rumors of a medical hinderance first surfaced back in 2014, but now that Lana is getting more physical with Summer Rae, the possible medical issue is being brought up again.
Source: Wrestling Observer Newsletter