Hi there...
How old is your LO now?
As you know 2:1 is a tricky balance, especially as LO's get closer to the 1 nap. Generally, LO's need to be able to comfortably handle around 4.5/5hrs A-time to manage 1 nap days. Have you ever tried any 1 nap days? A lot of Mums alternate 1 & 2 nap days for a while until their LO's are better able to manage the longer A-times.
From her routine, it looks like she's doing 12hrs at night? If so this is pretty good for an LO going through the transition. You could try a couple of things; 1/ Wake her at 7am & keep her nap at 10.30am or 2/ Push her AM nap back nearer 11am, (20/30mins) & then move PM nap to 3pm & push BT later. Unfortunately, avoiding long days when going through this transition is nearly impossible.
What do you think?