Over - Tradução em português

Hello friends, I'd like some help about these sentences, I couldn't understand the use of "over" in the first, I don't know if my translation or my understanding about the sentence is set in stone, that's why I'm asking you some support about it, for I know that you are the top notch!

I've invited some friends over for dinner ( Eu convidei alguns amigos a mais pro jantar )

Little did she know that he was going to be her boss one day ( Mal ela sabia que ele seria seu chefe um dia )

Thanks in advance!!!