First. YES to what
@gymtigermom said above.
Well, the good news is, we were warned how much homework my DD would have moving to middle school this year, and really, it's not bad at all. I know that doesn't mean your DD will have the same experience, but my DD's homework is nowhere near the 1.5 hours per day we were told she would have. She is focused in school and often finishes it all before getting home.
That said, she does not have any available honors courses except math, and she did not qualify for that this year.
In all honesty, I would perhaps start messaging some of these teachers directly, and ask them what the homework pattern is like. Perhaps if she really truly would prefer to be in all this honors courses, then maybe there some way to work it out that you can get a lot of it done on the weekends. Or, like others suggested, have your DD choose her favorites and that's that. It CAN be tough to 'catch up' moving from regular to GT, but if your DD is genuinely GT, she'll likely catch back up easily. It's also hard to 'admit defeat' and drop down from GT to "regular", especially for a more type A person. NO WAY would I have wanted to cave - what would my friends think? Now, as an adult, I know how trivial that is, but got a reminder this year that 6th graders are brutal.
I was GT through middle school, and I loved it and never felt overwhelmed with homework. When I was doing my undergrad, I genuinely preferred to do honors courses over regular courses, as I preferred the coursework. Well sure, they may have technically been more challenging, in a way they were almost easier because there was none of that crappy busywork. I got so bored in "regular" classes and easily checked out. As someone training to be an educator right now, you do NOT want that to happen to your DD if you can help it. You obviously also don't want her to burn out. How much sleep does your daughter seem to require? Our doc said for a 12 year old, 9 hours is the target. My DD seems to technically need a little bit more than this, but YDS actually seems to do well with less.
Perhaps you can work it out so that she could maybe have a free period at the end of the day where she could leave or get started on homework. Or, maybe she could start late. My DD's school was not willing to accommodate this, based on the way they structure courses. All of her electives are the last period of the day, so if she were to leave early every day, she'd actually miss two classes each trimester, as it rotates A day/B day, and her days start with language arts.