LiShin vs LiPing ( LiShin -WIN )

I found out Li Shin always used Petitio Principii ( Circular Argument) when I argue with her she always in the situation of win.

Which started like this:

Me: Hey, you should switch off the light and sleep now!

Li Shin: I should't sleep now because I have assignment to do now.I
have assignment to do now because I went shopping with you guys the whole day. I went shopping with you guys so I should not sleep
now to complete my assignment.

Me: But you still can sleep now and wake up early tomorrow to do your assignment!

Li Shin: I can't sleep now because I can't wake up early tomorrow.
If I can't wake up early tomorrow I can't complete my
assignment. I can't complete my assignment I'll fail my
assignment marks. So to avoid failing assignment marks I
can't sleep now.

Me: Alright you want to do your assignment is your business.
But please stop using CIRCULAR ARGUMENT! Switch off the light now I want to sleep and it is too bright for me now!

Li Shin: If I switch off the light......

Me: STOP IT! I sleep with Keh Shin now and you continue your
assignment! GOOD NIGHT!!!!!!!!! Wooo I lose again.......

Circular Argument
A is true, because B is true. And B is true because G is true. And G is true because A is true.