I'm so glad your first day of school went well overall! That is not always the case, even if we do everything just right, have the best of plans, and have dc placed accurately. Sometimes, it still all falls apart.

So, take encouragement it went well overall!

For me, it helps if I jot notes as we go, like these were some of my notes years past: "too loud during phonics time", "Emmett (our toddler) needs something else to do at this time", "Storytime only took 5 minutes instead of 15", or "ds needs a break to run/play/be wiggly about here", etc. I just wrote them right on my schedule, and that really helped me see patterns throughout the first week. Those problems in scheduling do make themselves known over time, but I find I lose sight of them when trying to think back over the whole day at the end of the day. That's why it helps me to jot notes as I go (this could be an age and memory thing for just me though

).
I will say overall, I've found I need it to be very quiet when doing phonics/ERS/DITHOR and when I am reading out loud. I can't take constant interruptions or noise during those times (and my dc don't like to be interrupted either), so I always have the other dc away doing something I know they can do independently for a set amount of time during those times. I find it's fine for me to have it be louder or have more interruptions during hands-on activities. I can also have it be semi-loud as I bounce between tables for independent grammar time (at the end of grammar), independent math time (at the end of math), and handwriting/copywork. I have one ds at the kitchen table, and one at the dining table, as they are too distracted by each other otherwise, hence me "bouncing" between them.

However, this again could just be a need I have.
For one of my dc, when he was doing LHFHG, he absolutely needed a playtime first thing in the morning with big brother. We set the timer for 30-45 minutes, and they just played. Yes, that made my older ds's day go longer (he was doing Bigger Hearts though, so we still finished by lunch), but it was worth it for my middle ds. This same ds also needed a break after doing half the LHFHG plans. I had him play in the middle for 30-45 minutes on his own. Then, when the timer rang he had to cheerfully pick up and finish out the other half of the plans. We did this for quite awhile. He eventually was able to do all of LHFHG in a row, though he still always needed his playtime first thing in the AM.
One point you could make to your dd about her comments about last year's teacher is she would have had a new teacher this year anyway, and that teacher would not have done things the same way either. I would be kind of firm on this, letting her know you are the teacher now and she does need to do things in the way you are asking her to as this is a sign of respect you'd expect her to have toward any of her teachers (you included).

I know this isn't such a big deal now, but it can turn into one.
If you get a chance to jot any notes about your day in particular that you would be willing to share, we could chat through more here! I'd love to help you in any way possible, but my hat's off to you for a good first day overall!!!

You may just need to give it some time for routine to settle in and do its magic.
In Christ,
Julie