"Crikey! Look at the teeth on that one!"
Six years ago, xenobiology was (mostly) a theoretical field of study- until the Mars expedition changed everything. Gwen Jackson was just finishing her thesis on the environmental adaptation of freshwater and saltwater crocodiles when she was summarily all-but drafted into the multinational task force developed to deal with a whole universe full of problems. She threw herself into a whole new realm of study- and quickly found herself fascinated by these so-called dragons. Of course she was on one of the arks- even if they didn't encounter any more dragons, they would have new worlds to explore- and new species to deal with...
Gwen is a scientist, but far more of a field scientist than a lab specialist. She has run studies in some of the harshest environments on earth, and dealt with some of its deadliest predators- and her studies of predatory reptiles just might be useful.
At this point I'm looking at Druid, possibly with Lore Bard, Ranger, or Feylock dip; Outlander background instead of Sage/Scientist, and probably the Skilled feat to round out her skills/tools. Survivalist, but not military. Might want a rifle proficiency (hunting, not military/automatic).