Ok, this is a tricky transition in that its not one size fits all, every LO is different with how this goes. The first thing to try though, in my experience, is to extend A times 1 and 2, then cap the afternoon nap and have a shorter A to bedtime. Keep in mind that at this age, an 11hr night is perfectly fine.
How long has she had 3hr A times? I'd say that she needs more (the EW suggests that she's getting the nap too soon after she wakes and should go once she's getting the right first A time for her). She will show tired signs at 3hr - she's used to it, but that doesn't mean its what she needs now. Having said that, if you increase her A times and she's still having 2 x 1.5hr naps and an 11hr night, that's great and may well stick around for a while.