Who would say it to whom? Everyone in the show is familiar with her background. It would be unrealistic exposition. She obviously has a science background because she's competently doing scientific stuff. She had that background in the comics, which they're clearly drawing from. They didn't just make it up because they needed a character to fill that role. They aren't really even having her do that work because they wanted someone to replace Simmons. They did it because they wanted to show that she's playing it safe and afraid to go out into the field.