Y/D/N - 11 years old.

"Hey, whatcha doing kiddo?" Negan walked over to his stepdaughter and watched her shoot the pistol.
"Learning to defend myself. I think me and Ava (A/N - if your daughter's name is Ava pretend the name is something else) are gonna go and scavenge sometime," she aimed again and fired, blasting the beer bottle.
"Where'd you get that gun?" Negan asked. He looked down to his side and saw an empty holster. Y/D/N giggled before unloading the gun and giving it back to him.
"Here, you can have it back," she said. "I'll use Dwight's."
"Nah, you can use it. I wanna watch you though. You seem to be getting better," Negan set Lucille aside and walked up to his daughter. He realized she had no ear protection and rummaged around until a pair of earmuffs were placed on her head. She rolled her eyes.
"Daddy N, I don't need ear protection," she shook her head and the earmuffs fell to her shoulders. "They just slow me down. Watch."
Y/D/N pulled the trigger and destroyed the bottle.
"I'm proud of you, little rascal," Negan smiled. "Maybe I'll even get you your own Lucille."
"I want a bow and arrow," she answered. "I'm looking for one when Ava and I go."
The blonde girl, Ava, walked in and smiled.
"Hi Negan," she smiled.
"Hey, Ava," he answered. "When you two going scavenging."
"I was coming here to ask if we could go now. I have no chores and Y/D/N finished all hers yesterday," Ava answered.
"Please Dad!!" Y/D/N begged. "I promise I won't get hurt!"
"I... I guess," Negan said reluctantly. "Go ask your mom."
"Yes sir. Come on, Ava," the blonde girl and Y/D/N ran out to find you.
"Mom!" Y/D/N called. You turned around to come face to face with your panting 11-year-old daughter.
"Hey, Y/D/N/N," (A/N - Y/D/N/N - your daughter's nickname) you smiled.
"Can Ava and I go scavenging?" She questioned.
"No!" You answered, scared for your little girl's safety.
"Please Mom! I promise I won't get hurt! You should've seen me! I shot fifteen beer bottles without messing up," Y/D/N begged. "Dad gave me his gun and told me to come ask you. Please!"
"What did your dad say?" You questioned.
"He said I could go if you said I could. Please, Mom!" Y/D/N begged like an old beggar and Ava looked just as desperate.
"Fine. Don't get hurt," you kissed your daughter's head and she and Ava ran off.
"Thanks Mom!" She called.
"Stay safe, baby girl."

"Wow, this place is massive," Y/D/N and Ava walked into the store where you were gonna try and find some supplies. The two 11-year-olds walked through the store, grabbing different stuff and laughing quietly at some jokes on magazines. Ava walked over to a gun counter and hopped over it.
"Come on, Y/D/N," she reached down to grab your daughter but a walker appeared behind her.
"AVA NO!" Y/D/N cried, but it was too late. The walker took a bite out of Ava's arm before Y/D/N could shoot it. Ava collapsed next to Y/D/N and had tears running down her cheeks.
"It hurts," she whimpered. Y/D/N felt tears on her face too but still wrapped Ava's free arm around her shoulders and put her arm around Ava's waist. They started the slow, forced walk back to Negan's camp.

Once they got back, Y/D/N let out a yell of distress.
"DADDY NEGAN!" she yelled. "MOMMA! ANYONE! HELP! AVA'S BEEN BIT!!"
Negan ran like a cheetah to his daughter's aid and saw her carrying the almost passed out girl.
"Dad it was an accident-"
"Sh, it's alright, Y/D/N," Negan said. He picked Ava up gently and carried her to the hospital wing. Y/D/N sobbed as Ava screamed. They had to cut her arm off.
"GOD NOO!" She yelled. Y/D/N buried her head in Negan's chest and cried.
"It's my fault, Dad. All my fault," she sobbed. "Ava's bit and it's all my fault."
"Don't beat yourself up, baby girl," Negan ordered.
"I don't never want to go scavenging again. Daddy I'm scared," she whimpered.
"Don't be scared, y/d/n. We can go scavanging again when you feel ready."

Sorry, I know this took forever but bear with me.
Also... 1.05 K READS?! THAT'S AWESOME YOU CUPCAKES! I'M HAPPY.