I've been off work for the past couple of months, but recently received a text from a co worker inviting me on a night out to celebrate her birthday. Her and I aren't close (she hadn't long started in my department when I went off) but do make polite conversation and see each other fairly often at work. I felt quite happy to be asked along with a few other girls from work and said yes. I've since arranged a babysitter for DD.
A couple of days ago I messaged another coworker (also invited on night out) if she wanted to meet up at the train station as we live close to each other. She replied to say that plans had been changed as birthday girl had been unwell so was now possibly cancelled but if going ahead would be dinner and drinks in another town rather than party night that was originally planned. No worries, I messaged the birthday girl to say I'd heard she hadn't been well, hope she was feeling better etc and she said she'd let me know by Friday (yesterday) what the plans were.
So night out is tonight and I still haven't heard from her but I have now heard from another co-worker that the night out is going ahead and everyone else has been informed of the new plans.
So to me it sounds as if I am no longer invited, which tbh stung quite a bit and has upset me more than I'd like to admit. AIBU or childish to be upset by this? Should I message birthday girl or just leave it altogether?