There is a pause here You go in! i'l just..... (thinks for a moment about what she will do next) put it back in the box. There is some other audio noise after she says 'just' which I do not believe is part of her speech. You go in is accented to make it a softened imperative, and it is closely coupled with what the speaker is planning to do (meaning "you do that /so/then/because/ i will do this") The pronunciation seems fairly natural, north american English to me. Is there a particular word you are having trouble with?