“anyone know of possible schools she’d have a chance of getting into?”
I think that the aquarium job will be good experience. I am not sure that it will be particularly unique among students wanting to study marine biology. If she gets strong references from senior people who work in the field that is likely to help. Also, given a soso GPA (or even with a great GPA) having some work experience in my opinion strengthens her application.
Do you have a geographic preference?
Most of the programs that I am familiar with are either very selective (eg, Stanford) or outside of the US. Some that come to mind as possibly worth looking at are the University of Maine, the University of Massachusetts Dartmouth, UNH, and two in eastern Canada: Dalhousie (in Nova Scotia) and Memorial University of Newfoundland. I do not know if a 2.9 will get your daughter into any of these. My wild guess is that Dalhousie would be the least likely with a 2.9 but I really do not know.
To me graduate school admissions happens rarely enough that it is hard to know what to expect.