>>4 Writing in second person can take a project to another level, but it's compatible with very few stories. Not just anything can be written in it. So unless you have something that's made for that POV, it just doesn't work, meanwhile 1st and 3rd are usually interchangeable.
>>1 Whether or not you want the reader to know what the people are talking about depends on whether you want the reader to be in the main character's shoes or to watch the protagonist's struggle. I think you have a great opportunity here of having a first person or third person limited narrator and really getting the reader to experience the protagonist's struggles. It's something that anyone who has traveled can relate to, and it has the potential of really giving depth and insight into the character we're following as the readers.
However, you're passing up that chance by translating what these other people are saying or by not providing the original dialogue at all. By doing that, you're separating us from the story, and by then it's just a nice story to read - not the interactive experience it could be.
Providing us with dialogue to analyze would also open a door for tossing in easter eggs and playful things you can do as the author. Perhaps she think she's having a casual conversation at the beginning with someone then, later on in the plot, she learns those same words, which turn out to be insults. We as the readers can then put two-and-two together and laugh at her for misunderstanding earlier. That again gives her depth and relate-ability.
So yeah. Those're my preferences, but what you do in the end is up to you alone.