If the two Us have a . in between them for a nose (U.U) It means they have closed their eyes and gone to sleep according to my teenager. I see that they don’t in your case though. Have you considered just asking them?
@diavolobella: @squirbel might be afraid the friend who signs off
that way is making a pass at her in a shy but kinky way. Let’s wait and find out what she finds out.