I didn't understand the point of beating up the thug at the end.  Why did she do that? 

It's been a long break between episodes, so my memory is a bit hazy, but I think the Thug was the one hired to retrieve the Amanda tapes and subsequently beat up Jack in the process. That's why she says "This is for Jack" when the ass kicking began. Yes, it does bring unwanted attention to her and her plans. But  s h i t  happens in the heat of the moment.........