Academic here, though I don’t know anything specific about OB.
This can be a miserable situation. Long experience says that when students struggle invisibly it usually snowballs, compromising both their social experience of university and their degree classification. So I am very glad you are already thinking about how to help.
Does your young relative have a Personal Tutor/Academic Adviser? At my uni, every new fresher is part of a small group assigned to an academic taking this role for the duration of study. We mainly give academic advice and oversight, but most of us also function to a greater or lesser extent as a port in a storm. In that role we are happy to steer students to counselling, lend a sympathetic ear, provide occasional 1-1academic support, etc. But the key difference as compared to school or college is that the student is expected to take the initiative, to set up a meeting and essentially to say ‘I’m struggling and I need some advice.’
My School is full of shy, kind men whose advisees are terrified to approach them in this manner. That’s a big mistake. Most advisers genuinely want to help. But a few really cannot be bothered. We wouldn’t want your young relative dealing with one of those at the moment. Your relative should def approach and make an ally of the shy, kind academic but steer clear of the occasional one who can’t be bothered. Usually the School or Faculty will have a Student Support Officer whose role is largely to help students who are feeling overwhelmed in one way or another. Usually this person has great rapport with students: it is almost a requirement. The SSO is a good alternative to the PT/AA.
I would strongly encourage your relative to approach either their PT/AA or their SSO. To do so with relative comfort, they should know that what you’re describing us utterly routine. Unless it is a very young, inexperienced PT/AA, the person will have heard it many times before, and be sympathetic. Your relative might also plan out what to say, and what they want from the meeting, simply because the more control they feel, the
better it is likely to go.
Uni is about making your own opportunities. Could you help your relative identify some interests, and then some relevant clubs?
Best wishes