Looks kind of like a chubby version of my mare, who is also 15.3 hands. I tried an Abetta with FQHB on her, but the bars were a bit long for her back. A Circle Y with an Arabian tree fits her well enough.
Each manufacturer means something different by full QH bars, or just QH, or wide or medium - makes it tough to buy over the Internet.
There is some good info here: Types of Saddles - Western Saddles
I've never bought a saddle from them, but they have clear explanations of what the differences are.