A month or two is not abnormal even this time of year, I had a big guy that I had as a rescue that only ate every two months. As long as she's not looking like she's loosing a lot of mass or acting lethargic I would not worry too much about it. make sure her temps are good and she's got plenty of water.
Even though she was on F/T you might need to go back to a couple of live feeds to help her get her eating instincts back on que (try live small rats instead of big ones tho). Also if she was in a breeding program before you got her there might be a possiblity that she retained some sperm from her last breeding and she could now be gravid.
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Tosha 
"Of course, this is just my opinion...and I believe I am God." -- Christopher Bianco
8.20.0 Ball Python (Harry and Fluffy and currently un-named)
1.0.0 Angolan Python
0.2.0 Feline (Pippen and Pandora)
0.0.1 Dessert Tortoise (Pope)
2.2.1 Fish (1,2,3,4)
0.0.3 Lizards rescued from pool skimmer