Will Shanshan Feng defend her title?
Will Lexi Thompson defend her title?
No. See Exception 1 under Rule 13
This is a common question and most players get confused. Basically if the ball rolls more than two club-lengths, from where it first struck a part of the course, regardless of direction, it must be re-dropped, see Rule 20-2c (vi). If the ball rolls and comes to rest nearer the hole than the point where the original ball last crossed the margin of the water, it must be re-dropped, see Rule 20-2c (vii)(c).