still trucking I see. good for you. I was pleased to see that you were out with friends.
You asked about your email.
what is your intent with the email?
Trying to create situations where boundaries can be enforced it not very authentic. It will be dismissed/ignored and at worst seen as flailing for power that is not there. Is there anything in it or about it that comes off as placating or supplicating?
There will always be opportunities to demonstrate strength, but trying to create situations to assert yourself will not be fruitful.
It appears that your daughter has been preemptively placed in the middle of this allready. Thats not cool. Keeping her there further, or being the one to actually place her there, would be uncool also. She is old enough to take responsibility for her own homework/reading.