It's been known that Tarasova hasn't coach full-time due to family and health issues since late 2005. If Mao is only working with her part-time then she needs to search for a full time coach. Probably some of the jump issues arising now is because Mao didn't have a coach to spot her.
Maybe she should consider Christy Ness, K.Yamaguchi's coach to help her. I believe she is known to help restore confidence and is a technician.