Hi
I'll try to answer your questions...
Would the first A time be the one at 6am or 730? 6am is not a get up time as far as I'm concerned (no1 would disagree!) but she takes some rocking and 30-40 minutes to get back to sleep after that wake up.
WU is 7am or after. I would continue to put her back down at the 6am WU even if it takes effort. you are teaching her that it is still night time and she must sleep.
I woke her during the last nap to try get the cat nap in at a decent time before the 730 bed time. Wouldn't leaving her for 2h impact on that?
Maybe but atm you are getting short naps. I am just suggesting that if you give her a long A time and she takes a long nap she will need time to sleep, it seems a little unfair to give her a substantially longer A time and then wake her up before she is ready. If you really have to cap the nap because you need to get to school then do so, if you need to cap the last nap consider reducing A time before/following.
I'm pretty tired tonight so you would need to double check my times here but this is just a rough guide to how your day might look on 2hr naps:
WU 7.30
A 1hr 45
S 9.15 - 11.15
A 1hr 45
S 1 - 3
A 1hr 45
S 4.45 - 6.15 (here 1hr 30 nap)
A 1hr 15/45 (option of shorter A before bed)
BT 7.30/8.00 (option of later BT if she usually doesn't sleep 12hrs at night)
Is 6am now our wake up time?! It's the third day in a row she has woken at this time and taken effort to get back to sleep.
Earlier wake ups can happen when a LOs first A time is too short. As I say above, re-settle at this time and treat as a NW.
Is it true that not enough A time on the first nap can lead to early morning wake ups?
Ha ha, yes! I am going through your posts answering as I go along
You can also see an OT EW if last A time is too long or if the whole day before was a rubbish sleep day and baby has gone to bed really OT. Looking at your LOs habit it seems more likely to me she needs longer first A. But do make sure you don't give too long an A to BT.
As you have the school run you will need to look at your entire day and work out what suits you all best as a family taking everyone's needs into account. It might be fore instance that the first nap begins on the run and she is transferred to her cot (or left in a carrier or pushchair for the entire nap), it may be that you keep this first nap short around the school drop off or around the school pick up. There are likely other naps you can really work on to be restorative sleeps, that means 1.5 or 2hrs long. it may take a bit of working out and it may take a bit of winging it but as school drop off and pick up is not optional you certainly will find a way for it to work. It's really ok to have a couple of CNs and a couple of long naps - I suggest aiming to keep to the same routine every day as babies form habits making the naps easier.