She's replaying the Magikarp Song over and over and she's playing Magikarp Jump.
She's basically a fan of Magikarp.
Responses (4)
Just ignore it. I know to you being "addicted" to a pokemon character sounds silly, but it's just her thing. Think about something that you're passionate about, be it sports or music, etc, would you want someone judging you or criticizing you for that? It is probably a phase that she will eventually grow out of. To ignore it I would tell you to just go into a different room when she is annoying you or put earphones in when she plays the song. I would suggest to you to not completely ignore her though, she is your sister. Be supportive to her interests no matter how "strange" they are, you may regret it one day if you don't.
Goodluck and I hope this helps!