I really don't think she would last to 1 every day.
12.20 then if it's the earliest she can nap at nursery? It's just that I really think you would get better nights and WU if every day was the same.
It would also help to see where things are not suiting her as the regularity of nap and BT would show how these relate to NW and EW/WU.
Anytime we've pushed her day longer she has several nw's clearly ot.
It isn't necessarily a longer day, it's a later nap, possibly later BT and later WU, just shifting things later. I'd do a 7pm BT mainly because it offers a 11-12 hr night with WU at 6-7am whereas if you do 6.30 BT then 11hrs comes out with a 5.30 WU and you are then counting on 11.5 - 12hr night to get through to 6-6.30am.