#1 Ronda Rousey interferes
Ronda Rousey is the Raw Women's Champion and it appears that she has an issue with both Charlotte and Becky Lynch, but even though Rousey was able to take out her frustrations on Lynch on Monday, she wasn't able to get her hands on Flair.
Rousey will collide with both of these women at WrestleMania if Lynch is able to overcome Flair, but she doesn't listen to WWE and she apparently doesn't follow a script. Which means that if she decides to come down and attack Flair or Lynch in order to make the WrestleMania triple threat, then she would.
Rousey wants Lynch in that WrestleMania main event, she's the reason that she has been given this chance to get back into the match and Rousey will do everything she can to ensure that this is the match that happens on April 8th.