POA's are basically Appaloosa/Shetland/Arab mixes so it wouldn't surprise me at all if she had a little (or a lot!) of Arab in her.
And according to the registry, POA's can be up to...I think 14h (the registry measures them in inches, not hands) or 56inches tall so if her mom was an Appy, I'm not surprised at all that she'd come out around 14.2. Especially if her dad was a larger POA.
Anyway, I absolutely adore POAs. If I could have a herd of POAs, I'd do it in a heartbeat. They are just the cutest things. And they often have the sassiest little attitudes...man, I just love them.
Just for funnsies (and for comparisons sake, but more funnsies), here's a few pictures of my most favoritest POA ever. He was quite the little mover too. :)
I hope you don't mind my POA picture spam...