It's true some level of inference occurs in these matters; we don't have all the data for a complete picture, so we have to 'connect the dots.' But we can do so logically, albeit with a risk of occasionally drawing an inaccurate conclusion.
It's true the shop likely isn't pushing her to do any dives (at least at this point). If this is a common Caribbean region scenario, a guide will lead a group, with this couple as part of it. She may not be under much professional supervision, as she's a certified diver, not taking a dive course.
On ScubaBoard, for a diver not thought to be cave certified to do some cave dives (even allegedly 'really safe ones') is a trigger casting someone's judgment into strong question. Maybe there's some explanation that would mitigate that, but we don't have it, and the default position tends to be that uncertified cave diving is moronic and dangerous.
If he thinks they'll be diving together, and he's got more experience and risk tolerance, her conservatism may hold him back a bit. That's my inference, not demonstrated reality. The impression I get from her original post on this thread is that she perceives it that way. It's a conflict of interest; he may be a fine fellow, but the temptation to 'encourage' (i.e.: pressure) her to see things in a way that facilitates what he wants to happen may be there. Even good people may rationalize serving their own desires. Note: between his 'cave diving' and her emphasis on adhering to indoctrination (e.g.: 'hammered into her skull' in training), it seems we may have a risk taker paired with a rule follower. Even if both are safe enough divers, just being at opposite ends of the bell curve may cause friction.
I'm not vilifying him. She was concerned enough to bring this issue to a public forum seeking guidance. She's got 12 dives and is concerned maybe she's 'being wimp,' and he supposedly cave dives (with ~ 150 dives mostly in high school and college, most not recent...I'm guessing without cave or cavern cert.?).
Nuance is key here. If we're talking an arbitrary belief 55 feet is okay but 65 feet is not, for example, I agree. But we may be talking about a different scenario...
1.) With a professional guide may not mean much if he's leading a group and not paying special attention to her. If he's made aware of her experience he might.
Note: bit of a tangent, but sometimes with less experienced divers, people choose to hire a private guide to provide more extensive direct supervision when diving a new place, pushing limits, etc...
2.) Diving 100 feet is not just a little further than 52. The more rapid air consumption and narcosis risks are substantial, as is the mental stress that while psychosomatic is still real.
I suspect if she does the dives she will probably return safely. But if she doesn't, and this matter turns into an Accidents & Incidents thread, we'll be talking about how some deaths are the end result of a cascade of bad choices that could've been aborted at a number of points, and how foolish risk-taking has put another body in the ground.