Thoroughly confused.

So the one who is mad is acting quite chipper and happy and outgoing and all that jazz, even towards the one she is mad at...like nothing even happened.
She isn't bringing it up at all.
And when I mentioned how upset the upset one was, the mad one simply said "oh I'll have to talk to her."
When approached about this by the other bystander, the mad one stormed off and evaded the subject completely.
WHAT THE HELL IS GOING ON?!?
The mad one hasn't talked to anyone! Or solved anything! At all!!!
Why is it suddenly all so happy and...happy?
I believe this calls for one huge
WTF, MATE?????