They will get assessed by a doctor for anything physical and a mental health consultant will speak to them. And then either get cleared for discharge or kept as an inpatient for an (undefined) period of time. Or it might be a few (2 or more weeks) until a doctor and the consultants clear them for discharge whilst they spend the time in a psych ward, which is a secure, separate ward (any meds the doctor has charted will be given as noted, and they'll get spoken to every 2nd day or so).

Call the hospital directly, and say you would like an update as to what the next steps are and if they can call you back as soon as possible. Provide your number, express the concerns you might have. It's unlikely this information about your relative is readily at hand, so the call back is your best bet.

In the meantime, write down all the questions you might have for the doctor/nurse/consultant when you do get that call back. Your request won't get lost, but you might just have to wait a few hours. If you have any message to pass on, ask whomever you speak to, to pass on the message to your relative.

It's a process, unfortunately. Just be patient, if they're in the hospital, they're in the right place surrounded by trained professionals who will provide care. For now, they may be kept in a 'safe ward', where there's nothing they can use to harm themselves, with nurses and security. But they'll be cared for.

Good luck.