Hi Honey,
First of all, just checking there's no other stuff going on like teething or walking development
it's always good to make sure before changing a routine that works
Otherwise, it does sound like some tweaking maybe in order, but that doesn't mean she is necessarily ready for 1 nap, there are other things to try such as a short cat nap in the am and a longer nap pm. This often works well, and that way you're less likely to get refusal of the 2nd nap. Having said all that it is also possible that days sleep started to rob night, hence the EW. It may just be that her day sleep needs capping to say, 2 hours and her night will settle again. I think short am nap of 30 mins followd by a 1.5 hour pm nap may be the way to go
What do you think
I guess her day would look something like this from an EW stand point.
6.30 WU
9.30 to 10.00 nap
12.00 to 1.30 nap
BT 7.30
I know that BT is too early for your ideal but the hopefully once her nights lengthen the day would naturally shift later.
(HUGS)
x.
x.