There is no required pph.. definitely is retaliation for your grievance, also harrassment.. I could win that one for you, but i don't know how strong your local is.. call your hall and speak with the b.a., if you have decent attendance and get there on time you should be able to win staying in your job area, and they should move her to a different area for looking to retaliate against you. Just don't give up on matter, too many people say to leave these little matters alone, and it's a waste of time.. this is why there are weak locals losing the good fight..