Well without even looking at the details of her spec I can tell you it's wrong. With that build her pet will being experiencing continual focus starvation and as a pet is 40% of a BM hunter's damage output that's a 20-30% drop in DPS right there.
53/11/7 is going to produce far more DPS
She also desperately needs to get hit capped. Hit transfers to pets in whole integers only (e.g. 6%, 7%, 8%) and so she's currently loosing even more DPS because her pet is focused staved AND missing a lot.
She should probably also run H-UK & H-UK till
[Drake-Mounted Crossbow] &
[Sovereign's Belt] drop if she doesn't have easy access to Naxx/Uldar gear as easily accessed upgrades.
Finally, she should get Shandara's spreadsheet and use it to assess her current gear, talents, pet and shot rotation to tweak things appropriately. It's also a great way of figuring out what gear is going to have the most affect on her DPS.