So, A is having fertility treatment. Colleague B has recently announced her pregnancy.
B understands it is difficult for A and is doing her best not to rub it in her face but A is being absolutely vile.
She has stated that she hates B both publically and privately and that that won't change even if she does fall pregnant, this is her time not to be shared with B etc etc. ATM A is very deliberately and publically refusing to speak to B. They are supposed to work closely together so this is an issue, quite apart from how upsetting it is for B.
So, is this one of those things management and colleagues gave to live with, understanding that A is struggling or is the lack of professionalism a disciplinary matter?