She'll be fine! They can go months and months without eating. You'll just have to get used to the occasional skipped meals.![]()
I doubt a change in wattage caused an issue, unless you went from a red light to a white one. (A bright white light shining directly in the cage can be a cause for stress) Maybe if the change caused a significant temperature drop. However...if, as you say, the temps are fine...then its not a concern.
Just give her some time and feed her again next week.