I agree with Cheesenugget. If a snake is having an issue feeding: I see no point trying to switch the type of food it has been fed until a pattern has been established.
There are no weights listed, but, fuzzy mice have very little nutrition and I only use them when I'm assist feeding a snake that is newly hatched and is approaching 'the point of no return'. It may be a good test to see if she will take one if left in the cage overnight, but, I would be offering/assist feeding 'hopper' mice that are 14-21 days old and have just started to open their eyes. I would offer live at first (always under supervision), then (if necessary) pre-kill and assist.
As far as the 'tap on nose': I would not use that method...the ball python may learn to associate the particular food item with a defensive reaction and you will have even more trouble.
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