Listen without rushing to fix things, ask what would help, and offer one small...

https://sophiasmasterblogs.timeforchangecounselling.com/how-do-i-support-someone-who-is-starting-treatment-but-still-angry-at-me

Listen without rushing to fix things, ask what would help, and offer one small next step, like sitting together while they call for an appointment. You can care and still set boundaries. Support may take more than one conversation, so check in again.