Well, this is my fantasy as to how things could have made Professor Umbridge mad during that year.  Warning this is an OotPs Spoiler

I own nothing of the following – JK Rowling & the other copyright holders, etc. own them.  Just using the characters in a fan fiction story – no money earned. 

Umbridge and the IWEA

Final Chapter: End Game for Umbridge

From the IWEA to Umbridge:

(Umbridge)

Dear Miss Umbridge:

It has come to our attention that you have been abusing your role as a High Inquisitor by writing decrees through the Ministry of Magic office you were asked to sever ties with.

We would like to inform you that a number of your transgressions against the students have been noted.  The usage of a blood quill, mail reading, the reforming of organizations, sports teams, study groups and other student enrichment programs.

The usage of a blood quill alone can get you permanent ban from the classroom on its own merits.  It is a against the International Wizarding education decrees to use devices that can harm students.   

You have also banned Harry Potter, Fred Weasley and George Weasley from the Quidditch team for Gryffindor House.  Banning of a student can not take place without a real reason.  Please state them for us.

Yours,

Leonard B. Merilynius

Chief of the Protectors of Wizarding Schools

Chief Auror of the International Wizarding Education Association

Order of Merlin First Class

CC: Professor Albus Dumbledore, Headmaster of Hogwarts in exile

       Professor Minerva McGonagall, Deputy Headmistress

       Cornelius Fudge, Minister of Magic - England

Banning Note:

July 1st.

Hogwarts Parents Association

London, England

Greetings

After a careful investigation, it has been decided to ban Professor Delores Umbridge officially from the classroom.

Her teaching methods have been found to be unprofessional.  In her role as an Acting Headmistress, she has used corporal punishment for detentions and threatened to even allow someone to whip a couple of students this year.

We would like to commend you for your concerns for the student body at Hogwarts.

Thank you for bringing this matter to our attention.

With Warmest Regards,

Martha D Stinkwood

Office of Teacher Licensure

International Wizarding Education Association

New York New York USA

Letter to Lee Jordan:

Lee Jordan

Hogsmeade Post Office Box LJ5

Dear Mr. Jordan,

Thank you for your concern of the students of Hogwarts, by now you already know of the outcome.

You might also be interested to note that members of the Inquisitorial Squad now have a letter in the official school records mentioning the time they spent as a squad member.  These letters are also noted with the International Quidditch Committees and also the various Ministry of Magic offices around the world.

Again, thank you for concerns.

Leonard B. Merilynius

Chief of the Protectors of Wizarding Schools

Chief Auror of the International Wizarding Education Association

Order of Merlin First Class

July 1st

Mr. Cornelius Fudge

Minister of Magic

London, England

Dear Mr. Fudge

After discussing matters with our investigators, it has come to our attention that Delores Jane Umbridge is in need of a visit to your St. Mungo's Hospital for a psychiatric evaluation.

We would like to receive a copy of the report upon completion.  She has disturbing issues that must be handled by a professional.  This last year, she allowed a severe form of punishment to be used – a Torture Quotes Quill.  This is something that was banned in most civilized nations over 150 years ago.  Where this quill came from, we are not sure.

 The other report we had was about the authorization to use whips on two 7th year students.  Luckily, the two students left before any harm came to them.

A copy of this letter will be on file with Professor Dumbledore.

We await your owl with the requested information no later than August 10th.

Sincerely,

Leonard B. Merilynius

Chief of the Protectors of Wizarding Schools

Chief Auror of the International Wizarding Education Association

Order of Merlin First Class