Child Custody Issues

[LostInMN]

Hi strangers, long time no see. My wife was unswerving in her desire to be divorced, it was finalized a few months ago. We agreed to 50/50 custody of our 8 yr old daughter, our only child. Yesterday, she informed me that our daughter has asked if we could go back to the arangement we had before school was released for the summer, which was daughter with mom during the week, I would have her 2 a few hours 2 nights a week, and she would spend every other weekend with me. This is considerably different than the 50/50 we have been doing the last few months. She also feels that our daughter should be involved in any discussion her and I have on the topic, since it is the daughters feelings and wants/desires that are being discussed. She has told our daughter, who is with her this week, that it may be an option and that we will have to talk about it.

I am dumbstruck. First, that she would imply to an 8 yr old that her wants and whims could possibly change a custody arangement. Also that she would feel she needs to be involved in any discussion of said arangement. I am looking for advice on how to approach her thi sweekend, I don't want to come off sounding like my daughters feelings don't matter, but also will not give up custody, I feel a child needs to have as much exposure to both parents as possibkle for a balanced upbringing.

This is what she'd said in an email to me earlier today:

My telephone call yesterday was to give you a heads up so that you were not
blindsided when Claire brought up her concerns. My intention was to
communicate a concern our daughter has. I believe that you would also
communicate to me any concerns she may express to you. My intention was
not to make your day "go to ****", but to schedule a time so I could update
you to her concerns. I advised Claire that she needed to speak to you about
her feelings. I don't believe this was irresponsible. To unequivocally
tell her "no" to her feelings/thoughts/concerns is simply wrong. By
dismissing her feelings/concerns, we are dismissing her. I strongly believe
that Claire needs to speak her mind. I believe that she needs to be part of
any conversation regarding her feelings/concerns; not allowing her to do so
would be disrespectful to her and her feelings. I also believe that all
of us need to have this conversation together; we need to hear what
eachother is saying so there is no chance of misunderstandings, which
unfortunately lead to hard feelings. This will also ensure there is no
chance of he-said, she-said. I believe that both of us have her best
interests at heart. Unfortunately, our issues sometimes make that seem less
than obvious.

Where do I start?

Thanks in advance for any advice, I can use all I can get.