Dear @five5five you're doing far too much and your DD needs to be made aware that you are struggling
My lovely mum retired at 63 to look after my DD so that I could go back to work full time. She took her here there and everywhere and I'm so grateful for the time and input she had - DD is a credit to her!
When the pandemic hit, DM's mobility wasn't great and when schools started back, she found it so difficult walking to school and back every day, she was devastated but we had a heart to heart and I realised she was struggling, so I changed my hours at work and got DH to do the same so we could coordinate childcare so that DM didn't have to do so much.
She now has DD(14) after school 2-3 times a week (DD walks there herself) and the arrangement works great for us.
Unfortunately DM is still needed to collect my Nephew (10) from school, even though she's now 77 and walks with a stick and a terrible limp 😥but she feels awful and refuses to speak to my brother and his wife about cutting back, she wants to wait till DNephew is at high school....
Anyway, what I'm getting at is that your DD is either oblivious to your struggles and is merrily going about her life thinking you are ok with the arrangement OR she knows you are struggling and is hoping you won't bring it up - you need to speak to her and tell her things have to change
Good luck