I know it's annoying when people always complain and are negative but she could also be annoyed with you advising her on her vacation choices ( unless she asks for advice) as well as unsolicited criticism).

I had people making comments about my vacation choices: "what's there to see in Arizona except cacti? You are willing to drive to Tennessee just to see great smokies? You like NYC? Isn't it crowded there? You like France???? Why? People are so rude there!" I am not kidding.

I think the only time you should advice on vacation choices is when they explicitly ask. Otherwise leg them make their own choices.

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