I have a friend/acquaintance who is very slow to answer messages. I can see from WhatsApp that she is using her phone quite a bit, so she's not someone who only rarely picks it up.
She's been like this for years and there have also been instances where she has been a bit rude to me (excluding me from arrangements etc) She's very friendly to me in person but I think I just have to accept she doesn't like me that much. The question is how to react to the latest situation. I messaged her yesterday to tell her I had fixed an introduction for a job interview for her daughter (we had previously discussed it and she seemed keen for me to do it). It's quite a nice and potentially useful/helpful thing for me to have done. She read the message yesterday afternoon and has been online umpteen times since but has not replied.
I know the usual advice on MN is dignified silence but I am really pissed off with her and am minded to say something. Any suggestions?