Here's the game....
....your *boss* as you refer to her,..now get this...she has no damn business in her position...ZERO.
You dont mention what type of work you do, or at what level she or you are at, but she is spinless and politically motivated. NOBODY, repeat,nobody who is a professional manager puts that sort of **** in a damn memo. Nobody.
She needs to call you into her office discretely for a meeting, a meeting that is conducted in a manner that tells you where you are deficient, and than tells you what needs to be done to insure you are successful at fulfilling her requirements.
If you continue to fail she is to continue to do this and provide addtional training if it is fesuible, ta tell you what is going to happen if you continue to be deficient. This is called progressive discipline with discipline meaning to counsel and assist.
This woman hasn't any balls, she is one of these people that manages by getting people to like her and the result will eventually be failure if she is in a high postion in a serious organization. I can see it now, she likes ass kissers whoo pretend to like her.
You approach her, ask her for a meeting and request she inform yu what is expected assuming that you don't already know. You will know right away if it is abot principle or personality. You just need to make sure ou performance is bullet proof. Not hard to do if you know what is expected. I guarantee you that when you request this meetig she will squirm. She hs no balls.
In any professional company (what irony here) there are 3 kisses of death. One is to go over your supervisors head as in using the so called chain of command. The other 2 are to be a whistle blower and the last is to go to HR with a problem about your supervisor. That is corporate America in a nut shell.
Your only other option is to leave.