Every office has a steward assigned to it, even if there is no local steward there is a steward that oversees that office. You can look that up on the NRLCA website under "find my steward". You may also on that site find a blank form 3971,that you may fill out and give to you pm. It looks a little different because it has the front and back of the form on one page. Anytime a pm will not give you forms that you need you may file a grievance asking for proper supplies.
It really sounds like your pm needs a visit from an area steward or the district steward,to explain that her employees have to follow her direct orders, just as she has to follow the contract, because it was created by her superiors, and disregarding it, is disregarding their "direct order"of which she also can be disciplined, just like us. When she advances in her career enough to write, and get accepted, contracts for the USPS she then can dictate her ideas, but for now she is just a "pee-on" like us. When these types of managers receive this type of "direction" they usually take one of two avenues. 1) Pout, stay in their office alone and suck their thumbs . 2) Attempt retaliation, which, when documented and grieved, put them in deeper water than they thought they were going to put you in. These pm's can be lead to know and believe that they will receive more work and grief continuing in their poor managing and attitude than those types of actions are worth. If you could organize your office into an all out grievance "attack" for every infraction she commits, after your steward has conferred with her, she either will move to another office or change her "wicked" ways. Good luck.