Hello honey,
There are a couple of things that pop out looking at her routine. First of all her day is very long at 14.5 hours, which obviously makes her night short too. Most LO would be looking at a day of 13 hours maximum at her age. Secondly her morning A time is also quite long for a 2 nap routine. Usually when a LO goes to a 1 nap routine you would be looking to push the morning A time to 5 hours and your DD is already doing 4.5 or 5 hours.
With all the above in mind if she were my little girl I would be looking at going to 1 nap provided she isn't tired being pushed through that long morning. Does she handle it okay
If so I would keep her morning to 5 hours maximum and then let her have a nice long uncapped nap. Then BT will be around 5.5/6 hours later so her day would look like this:
WU 5 am
Nap 10.00 uncapped.
WU from nap hopefully at least 2 hours later at 12.00 hopefully later.
BT 5.5/6 hours after waking from nap so 6.00/6.30
I should imagine that she will pull some nice long CU nights once she is adjusted to this routine, and then WU and the day will naturally shift later.
If you keep those 2 naps at the length they are her day is always going to be too long causing OT and day sleep robbing night IMHO. I think you would have to look at shortening both A times Hun.
Hope this helps, what do you think
BTW my little boy went to 1 nap at 12 months for exactly the same reason
Vicki.x.