She went on to explain that not only were those places extremely rare but they had to be hidden because certain people would destroy the evidence of humans and dinosaurs living at the same time.
I gave her a big hummmmmmmm and changed the subject.
I'm not so dismissive of those claims, myself. The fossil record represents only a tiny fraction of what lived and died (and when) in the past ca. 2.5 billion years and we are a bit hubristic to think that we have anything more than a basic framework for determining these things. Personally, it wouldn't surprise me if fossils of dinosaurs surviving well past the the end of the Cretaceous were eventually discovered.
Here's a website that is probably the source of some of your friend's claims. The evidence here is far from conclusive, but I personally find it very interesting.
http://www.bible.ca/tracks/tracks.htm
What my friend was suggesting was that the earth is 6000 years old and the side by side foot prints of dinosaurs and humans was proof.
Sooooooo how's the weather where you are? ;9)