Melissa, what about trying 6hr A / 2hr nap / 5hr A, so up 7am, nap 1-3 & bed 8pm & stick to it like glue for a week. I hope you can achieve it, but TBH I think a 2hr nap is too much for lots of our LO's at this age, & I also think that if she has one, she simply won't sleep 11hrs at night.
We are getting an 11hr night with a 1.5hr nap. DS has done his 1st no nap day today.x