How would you react to someone who suddenly cuts you off permanently out of misunderstandings??

It was a surprise today that someone suddenly did that to me out of a misunderstanding.

'Misunderstanding' as in she saw me in a situation (this is pure friendship) and she was surprised and somehow made her own assumptions...and sent me a message that there's nothing to chat about anymore and wished me luck for the future endeavors.
It's obviously a goodbye message.

I did reply by saying that she could just ask for an explanation because 'misunderstandings' can ruin any relationship.
Most likely she won't read my reply (because I noticed she changed her privacy settings towards me).

Well, all in all...it seemed immature (unless the person truly understands the other person and the whole situation).

I did decide to give her some prayers though.
I mean, it's sort of like...like it or not, we don't really have everyone.