It's quite obvious the account is hacked or purchased, and I'm also convinced that it wasn't your sister's account that got banned, but yours. Either way you deserve a neg.
it looks like it's just your opinion,
just like that? very absurd,
It's not just The Pharmacist's opinion, I too think the account is hacked. How else did it change from decent English to Indonesian bounty spammer? To top that, I don't think you're the hacker, I think you bought it.
That leaves 2 questions: how did you buy it, and why did you buy a Newbie account instead of creating one yourself?