Harry Potter fan fiction: Jennie Black and the Auror's secret

The invite

"AAAHHHH!" Jennie woke up with a start. Another dream. Death. Her snake bite on her neck was bleeding. Not like others where red blood comes out, it was more like poison, green poison.
"Get up! Get up scullery maid! You need to make breakfast!" There was a rapping on the door.
"Fine Aunty Beletr..."
"THAT'S MADAM TO YOU! NOW GET UP!" She got up and put on her maid gown. Sleeping in the basement is cold... so cold. Only having a sleeping bag to sleep in didn't help either. She ran upstairs and cooked bacon. She was so hungry. She hadn't eaten in a full meal in MONTHS. All she ate was scraps of meat and rats. She put the bread the toaster. When she turned around Bellatrix had her whip. She screamed and ran out the front door. She ran until her legs were dead.
"JENNIE?!" Harley Lupin had ran out of her newsagents "are you ok?"
"Bellatrix...whip...dream..." she gasped
"Oh my Lord!" Harley ran inside. Jennie heard a crack and nothing happened. A few minutes later Harley ran out.
"I warned someone. He's coming tomorrow." She spoke as if nothing was more important. "Also you gotta go home and lock your room door so she can't get you!"
"Ok Harley" she hurried along the street. Jennie knew she would be safe soon.

Jennie was in her room. She had done as Harley asked. She had locked herself in her room and waited. And waited... and... waited. No one came for 16 hours. She had fallen asleep.
BANG!
Her door had been blown down. She jumped awake and sat upright. There stood a man. Was he a man? He was more a giant.
" 'ello Jennie. I'm 'agrid. I'm gonna take you to 'ogwarts."
"Who are you? What are you?"
"I just said. I'm 'agrid. I'm here to 'elp!"
"But...im confused. What are you helping me with?"
"Beletrix...isn' your aunt. She killed you real aunt so... i'll let dumbledore explain when you get to 'ogwarts."
"Um...ok" Jennie stood up "where are we going?"
"Just you wait! It's beautiful!" Then on the way there Hagrid explained everything to Jennie.