How many other hides do you have in the tank? Could there be something else she likes about the humid hide other than the humidity, such as the temperature, darkness level, etc?
I wouldn't worry to much at this point. I have two leopard geckos right now and both of them will hang out in their humid hides once in awhile, even during times when they are not shedding. Both of mine have been doing this since I got them and they are both very healthy.
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