"Milk" said Enid.
"What's that, dear?" asked Ollivander.
"May I have a glass of milk, pleas? I really need to drink some milk"
"I'm sorry but what it is have to do anything with my theory?".
"A lot", said Enid. "Bring me a glass of milk and I'll explain everything".

She IS crazy, thought Mr. Ollivander while he was getting that girl her glass of milk.
After a few minutes Mr. Ollivander came back, more sure about his theory from second to second.
Enid drank the milk in seconds, and just closed her eyes and stood still.
Well, there is limit of how much Mr. Ollivander can be Patient!
"I was right wasn't I? You are crazy. I think I'm going to ask you to leave my shop", said Mr. Ollivander loudly, nearly shouting.
"Sir, I'm as sane as you are. Now I will tell you my story, I believe it'll answer your questions.

I always loved Hogwarts. Actually, I was born there.
Right under the third row of the Qudditch pitch, chair 6."

"You were born under a chair?!" asked Mr. Ollivander surprisingly.

"You will understand everything. Now let me tell the whole story without interruptions. Where was I? Oh yes, my mother died 2 months after I was born. I don't really remember her so my step mom is for me like my real mom.

Anyway, I grew up in Hogwarts.

I loved the woods, the fresh air, and the students playing with me. I had some friends; I was even quit close to Albus Dumbledore. We used to do walks together around the castle. But, more than anything I was very best friends with Nissi, who everyone else knew as Mrs Norris.

Nissi and I weren't friends at first. She was always stalking students, I didn't like it. But after I got to know her better I started to like her. She told me all about her adventures with Argus Filtch, her owner, and everything she knew about Hogwarts. I wasn't helping her follow the students but I saw her as someone who appreciates the law, and I respected that.

"And then", said Enid in sorrow, "When Nissi was petrified I was so sad. Argus was too, he was crying every night, staying next to her, never left her the little bed they made for her at the hospital wing.

But I wasn't going to wait for miracles. I decided I'm going to save Nissi. So, I went to the library. That's where I met my step mom, Irma.

The first time I met mom I came into the library to the Attacking Section. She saw me looking for books and just said "Came to help poor Mrs. Norris eh?"
I nodded. Ever since for every day we were looking through books trying to find out as much as we can about petrifaction (I think she helped me, at first at least, because she wanted to make Argus happy) but we found out nothing… Luckily, I still don't know how, harry potter found out who did this to Nissi and she was healed.
I was so happy to be united with Nissi again but from this horrible attack I found a new friend, well actually a new family.
During the many days Irma and I spent together she always told me she wanted a daughter, someone to read bed-time stories to, to help her in the library.
I think she was quit lonely. All alone there, in that huge library, surrounded by books.
After Nissi was healed we had so much to catch up I didn't have time for Irma, but I always took care of her.
A few years later she and Argus became close friends and they even dated a while but they broke up after short time because Irma wanted children; though for some reason she didn't thought that wizards should breed with squibs.

Irma became sadder and sadder every day, lonelier than ever ; And then, 9 years ago, I decided to help her.

I always felt Irma was more than a friend to me; we got along so well together, I felt like she's my family. Why not make it completely true, then?
So… I decided I will be her daughter.
I came to the library and brought Irma a little book I found in the Restricted Section during my poor attempts to help Nissi; It was "Gamp's Law of Elemental Transfiguration Plot Holes".
The minute Irma read the title she knew what exceptional rule I was talking about.

Can YOU guess what rule I meant?