Hi J.. The issues with the afternoon nap is a pretty common problem at this age -- it happened with both my kids and with most of my friends' kids. I suggest two things: moving bedtime 20 or 30 minutes earlier, and shortening the morning nap to 1 -- 1 1/2 hours total (even though your daughter is not sleeping at this time right now, I bet she will).
I really don't know what to tell you about the morning nap. Perhaps you should move that nap 30 minutes earlier (even before she is rubbing her eyes.) Maybe she is actually over-tired and is not able to settle down to sleep.
I think I would try several different ideas before moving her to one nap a day. Only 17% of babies ages 10-12 months require only one nap a day. Maybe your daughter is one of them! But don't give up on the 2 naps a day before you try everything.