Katherine, I will be honest with you, I have never been good at figuring out this whole EASY/A times/nap lengths thing, hence why I really struggled to get it right!! lol
I *think* a 45min am nap followed by say 3.5hr A time would work for you LO's age. The tricky part is getting there, because often you want to move slowly towards new A and nap times rather than just jump into it. What kind of baby is your LO? If she is easy going and textbook, you could probably get away with just jumping into the new times and seeing how it goes. My LO is like this, I don't have to do things too gradually. However if she is more touchy and prone to OT you'd have to make the change slower, maybe dropping the am nap down to 1hr for a few days and playing with the following A times. I never had the patience to do that stuff, so thank goodness my DS just rolls with the punches!
We didn't get the point until he was 13.5mo. The mistake I made starting at 12mo was I was letting him nap 1hr-1hr15mins in the am and pushing that nap back while the pm nap got shorter. Inevitably he started refusing the pm nap. So I thought I could just push him to one nap and was so wrong, things were a disaster.
I started doing the short am nap (20mins for us) about 2wks ago I think, and I saw instant results, as in things were better within a day or two. Once I figured out how long a nap he needed in the am and what A time he needed in the pm, it was like a puzzle piece clicking into place. So we are going to ride it out this way until he shows signs of finally dropping the am nap and going to one nap, but I won't be making the mistake of pushing him to it again! lol
Keep her bedtime in mind too, right now her nights are a little short but if you play around with her naps be prepared to need an earlier bedtime.
Hope this helps a little, like I said I am not good at the specifics I'm afraid.
Better at sharing my experience. But some of the other moms and mods are really good at getting it down more precisely, so if no one else jumps on this thread don't be afraid to start a new one (maybe in the EASY forum) to get some fresh opinions.