Unfortunately, I think my advice would be to wait. At least until she's around 250g and then the prey item will be around 20% of her weight. And maybe only do once a week or every 10 days until she's around 300 grams then back to every 5 days? Does that make sense?
Also, you can always use the string method to test for prey size. Take a string and wrap it around her widest point and make a mark where the string meets. Then do this to the prey item. Often, the fur is deceiving in that it makes them look bigger (fluffy).
Of course, there really is NO problem with mice. You could always feed 2 mice until she's up to size for the rats.
I sort of feel like I was rambling...I hope you got all that...
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