Aw, she's so sweet but stupid. What's her number?

I'm sorry, but this is hilarious 😂 how did she come to that logic? Baffling

Tell her you appreciate her support but you really want to be alone right now, then reschedule for hanging out.

I hope your sister is still in preschool. Otherwise not knowing what simple words and concepts like alone mean would be a big issue.

Now, tell her to "get the fuck outta here, bitch !" and see if she still wants to keep you company when you're having a need-to-be-alone moment.