Is there a certain order that I have to use to digest the little girl?
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You have to normally struggle (stop the little girl from digesting you), then after you are done you can choose to whethever eat her or just go away. In your situation, you have to eat her, it asks you "Really eat her?". You have to pick yes, because if you will choose no, she will digest you (and there is not going to be any solution to that.)