Sometimes, people are just venting their frustrations and not really asking for advice. Did she specifically ask you for advice?
Be careful about giving someone unsolicited advice. Unless they specifically ask for advice, just let it go. If you don't want to hear them vent anymore then don't listen to them.
I agree with her about Mexico, because just yesterday I was researching travel places and that country was listed as one of the most dangerous for tourists. I would not go there either.