How do I deal with an annoying step-sister?

Anonymous
OK so I still live with my mom while I go to college so I can use my money for my son until I get a full-time job. Well my step-sister is here for the week. Well she's 11 and is always attached to my hip, tries to take care of my son like he's her baby, and never shuts up! Now I know she's young and maybe I should just deal with it, but lets just say I can deal with taking care of a 5 months old, 9 month old, 3 year old, and a 4 year old all at once better than I can deal with her (and I've actually done that before).

Does anyone have any advice on how I can just deal with her without being horribly mean and before I go completely insane?
How do I deal with an annoying step-sister?
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