I don't think you have clarified, are you feeding rat fuzzies or mouse fuzzies? I would go with a rat pup. My 5 month old Lemon Pastel is eating small rats, your should be able to take a rat pup.
They won't get sick from eating two, you'll just have to give her extra time to digest. Just in case, always give your snake 48 hours to digest their food.
Edit: Also, I know you're in Europe, but here in the states we don't trust anyone in a pet shop unless they've proven otherwise. Just because they say it's a female, I wouldn't trust that unless you saw them sex the snake in front of you.
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