While I swear I am not stalking the OP, I did feel an affinity for him and his family and remember him from earlier posts because their situation was a little parallel to mine. If I recall correctly, the OP's wife was recently in nursing school. (I went back to school to become a nurse after having a family). My guess is that she has gone back to school for a career change and her new job is likely her first nursing job. My previous post referred to the stress of a new job in the nursing field with a family and crazy 12 hour shifts. In addition, the OP has mentioned in the past that they try to keep their DD involved in the family by missing practice for Church and sibling activities. I don't know if the late drop offs or missed practices are in addition to the previously mentioned reasons. But, it may be that OP's wife feels it is accepteble to be late or miss at times to spend time with mom if it is has been okay to miss for Church and sibling actuvities.
I could be projecting my family's personal stressors from my early days as an RN after over a decade as a stay at home mom, so I apologize OP if this isnt at all analogous. But, in case it is, I understand those stressors and really suggest that OP and his wife take some time to evaluate her place and concerns with their new reality and then figure out how gymnastics fits into that reality. After all, no matter how talented, family is forever and gymnastics is finite.