What happened to Susan Pevensie (Sherlock x Narnia)

1

Susan Pevensie walked down the street of a busy town. She wasn't walking without purpose though.
No, she had a destination to get to. That was, a library where a reading club meeting started in fifteen minutes.

She crossed a street, turned two times right and found herself in front of the library door. She pushed and entered.
There was a lady behind the counter.
Mrs. Phelps read her nametag.

"Excuse me? I am here for the book club meeting at four?"

The woman looked up from a book she was fixing with tape.

"Oh, but of course. Right back there in the middle of mistery and fantasy book shelves."

"Thank you." Susan said and smiled.

She got a warm smile in reply and then moved on. The place was easy to find. There was a circle of chairs between two shelves. She wasn't the first one to be there. There were already two men and a woman. The woman was reading a book and the two men were whisper talking to each other.
They stoppped once she sat down on the opposite side of the woman and four seats from the man on the right.
She pulled out her own book. It was old and quite worn out, yet still precious to the eye of the owner. The old copy of The Hobbit once belonged to her younger brother-
Susan shook her head. No, she was not going to think about that right now. Her fingers traced the cover and carefully opened the book. She looked at her watch. Five more minutes. Her gaze shifted back to the letters.

'In a hole in the ground there lived a hobbit...'

Susan let out a sight. Those words always reminded her of the old times. Unaware of a pair of eyes that watched her every movement she kept on reading.
The man on the right was watching her trying to recognize her. Where did he know her from? Where? Then he remembered. And the memory made a grin appear on his face.

"What's the matter?" asked the other, shorter, man.

"You will see," was the answer.

More people came including the organizer and the meeting begins. They started with introduction circle. Susan was third in the row. When it was her turn, throwing her hair over her shoulder, she started:

"Right, so it's Susan and..."

She got interupted by laughter. She turned and found that it was comming from the man that was closer to her. The one with black hair and an over-coat tossed on the back of his chair.

"Um, excuse me, what's so funny?" she asked, irritation visible in her voice.

"I just.. Susan? You dont go by Phyllis anymore?" he asked with a half smile.

Susan thought. There was silence for a moment and then her face lit up as she remembered. The boy, the train station, the fight and-

"No... I don't use that name anymore," she said and looked at him. There was pain in her eyes, tangible and sharp, and it shocked him.

What kind of thing must have happened to her?

What kind of thing left scars on the soul that are so visible?

He shut up after that and she resumed her introduction. Another four take turn and then it was time for the man.

"The name is Matthew and I am here to get some recomendations since I am in a terrible reading slump."

Susan nearly laughed out loud. Matthew? As if that was his real name. She took a breath to recounter the bicker but was stopped by a look he gave her.
It was silent and pleading.
'Don't do it.' it said.
So she stayed silent and held her book tightly. What had Sherlock gotten himself into?