I got the orb from Mickey went back to Mona... but no dialog about the orb.. I have not talked to the young girl behind her.. I have talked to the guy with the bad toothache..
I had that happen once, but then I patched the game and started again and it hasn't happened since so I don't know what caused it. I never thought to mention it before now, talking to tooth ache guy or the girl behind mona won't help, there'll still be no dialogue about the orb.