a couple things you should keep in mind, that cage is too small for an 11 foot retic especially female. also, a retic that is 11 foot is probably at least a 1 - 1 1/2 year old, so she has been used to free roam of her wild habitat. they have a real hard time adjusting to captivity. she is also probably not used to human contact which adds more stress on her. all these could be reasons why she is not eating. however, it is winter time, she just maybe off feed due to the time of year (little cooler temps, and shorter daylight hours. i had a w/c thai yellowhead that was more of a rescue that i took in that didnt eat for 11 months, turns out he had intestinal parasites, that is another thing to consider, w/c snakes often come with parasites. so there are alot of factors that could attribute to not eating or a combination of all of them. also w/c snakes are much harder to tame to human handling.
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retic is king of kings
1.0 Tiger Retic
1.0 Albino Tiger Retic
0.1 Striped Tiger Retic (het albino)
0.1 Salmon Boa
0.1 False Water Cobra