my snake wont eat?

[scottyy]

i just moved my two year old retic into her final 8'x4'x3' enclosure and the temp on the hot side is 94 and about 78-80 on the cool side with a humidity of 50%-60%. she has been in there for about 4 weeks not without eating at all. i have been offering food and she seems interested but when she gets close to striking she just backs down and slithers away. i have never had trouble with her eating before and i dont understand why she seems so interested but just wont eat it.