Sasha Banks is currently dealing with an undisclosed injury according to the latest Wrestling Observer Newsletter which is why she disappeared from television over the past week. 

Banks last competed in Brooklyn on Dec. 28 in which she won against Becky Lynch.

Given we don't know the seriousness of her injury it may be wise to assume WWE are playing it safe and keeping her off television to prevent further injury given they have several top names already out with serious injury.