As @mcdude said. Save your reversal untill she had used her pounce. After that try to get as close as possible to get a punch on her. A decent amount of maeve players freak and use pounce to get some cover before going out again. Chase her.
Ying's illusions can be used as barriers when BK is at his ultimate, they prevent BK from moving, like a pole, and abusing it can be the key to winning a team fight