User blog comment:IamJakuhoRaikoben/Chapter 335: The Time of Life, Review./@comment-4449950-20130615131345/@comment-7418318-20130616141358

Maybe lil' Milliana doesn't have the physical strength to carry Erza alone.

Neither would it be all that surprising if, caught up in her emotional turmoil, she ran off by herself. She was after all going to start a fight with Jellal right on this very battlefield, which would indicate that her reasoning abilities aren't exactly working overtime right now.