Posting here for traffic.
Our close friend has had a lot of struggles with her mental health over the last few years (bipolar disorder). She is a gentle, kind and patient soul who hates confrontation.
She started to get irritable (very out of character) a few months ago and withdraw socially. We were meeting for lunch as a group and a couple of weeks ago and while we thought it would be too much for her, we didn't want to not ask so put the info in the WhatsApp chat and she has left the group. She has also deleted pretty much everything off her social media and stopped posting.
I've been reading up on bipolar and it sounds like the irritability could be hypomania which seems to be followed by depression, shame and guilt for how you've behaved when hypomanic.
Would it be a good idea to send a card? I saw some on Etsy that just say 'here when you need me' and thought of just signing it inside as a sort of low level gesture where she's not under pressure to respond (like with text) but knows people still care. She's a really good person and we miss her desperately.