It's possible that 'we' are Elsa's colleagues or partners in a scientific study about dinosaurs. They went out to do some fieldwork or research related to dinosaurs and have now returned to share their results or experiences with Elsa.
Maybe 'we' are some characters in a fictional world. They could be time - travelers who visited the age of dinosaurs and are now coming back to their normal time and place to talk to Elsa about their adventure. So, 'we' are those time - traveling adventurers.