How is it better to send a greeting message when my boyfriend's mother is in hospital?

I think you went to see your boyfriend's mother. However, it is also good to send some greeting messages, and you can also express your feelings. I think your boyfriend and mother should know something about you. Sending short messages about hospital greetings actually focuses on sincerity, not gorgeous. You can say: Auntie wishes you a speedy recovery and happiness every day. Actually, I'm not very good at talking. Go and see your boyfriend's mother when you have time, which shows your sincerity.