If it goes down, she'll be fine. You are worrying too much, but you're still new. They don't always need to be fed the perfect-sized meal. Sometimes bigger, sometimes smaller.
Think about it from our perspective for a moment. Do you always eat the same sized meals? Do you ever "eat with your eyes?" When/if you do, you feel a bit bloated and you digest your food for a longer period of time. Then when you're done digesting you get back at it again.
For the record, the only people I know who measure their food and eat the same amounts every day are those on very strict diets for health reasons and bodybuilders. I don't think a snake matches either category. I would highly suggest you do some reading on general care of ball pythons and what to expect. It will solve a lot of your worries. Welcome to the hobby!
Edit: This should be helpful, and get you started. http://ball-pythons.net/forums/showt...ius)-Caresheet
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