I've understood it to mean something that requires hospitalization or an injury/accident/medication reaction of some sort where I need care outside of therapy, or a ride home. I'm not sure how SI fits into that, but I guess it would depend on if you need medical attention? It's more of a notification clause. The last one I saw said it did not relate to sui thoughts, only if I had an accident while there and/or needed hospitalization.

If I were you, I would just ask her what it means to her, and if there's any uncertainty after that, then try to broach the topic of SI to the extent that you feel comfortable.