WHY DOES MY SISTER TALK TO HERSELF? Like this: hey do you like horses? yeah! since when? since i don't know i just like em.

She does this in stores and she's loud about it too!

SO MAY I ASK YOU WHY!?

She's probably lonely and doesn't have people to talk to. Although if she's doing it in store, I'm not sure. It depends on how old your sister is. If she's a child, she probably has an imaginary friend, but otherwise, I'm not sure.

Explanation:

Does she have any friends???

Explanation:

It may be because she has no friends or her friends don't talk to much

answer; im thinking (france);