To be honest I wouldn't worry too much after 4 months if she is not showing any sign of illness or change in behaviour.
What I can suggest is to triple check your husbandry and make sure everything is good. I have had success with boosting the ambient air temp in my reptile room for some of my females that have gone off food.
What size prey item are you feeding? You might just intice her to eat if you give her a smaller prey item, something smaller then what she normally eats.
Keep an eye on her weight and feed her on her normal feeding schedule and when she is ready she will start feeding again.
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