Is this written believably?

Penelope is abused by her dad, which started about 1 year ago. He has just slapped her for being home a few minutes after dark. Having no experience with writing or the ways of an abusive relationship I don't know whether this is a believable reaction on Penelope's part. Thank you for any feedback you can... show more Penelope is abused by her dad, which started about 1 year ago. He has just slapped her for being home a few minutes after dark. Having no experience with writing or the ways of an abusive relationship I don't know whether this is a believable reaction on Penelope's part. Thank you for any feedback you can give me!

Peering first through the window to check if the room was clear, Penelope snuck inside. She tiptoed down the hall and locked herself inside the bathroom. She turned on the taps to run a bath. The room began to fill with smoke and the sound of running water. Now that she was sure no one would hear her, she crumpled to the floor and began to cry. Her whole body shook with every sob. She hugged her knees to her chest and hid her face in her hands. Then she remembered the bath, which was nearly overflowing and leant over to turn it off. She dragged herself across the floor, her limbs flaring up with the pain of his abuse. Gripping the edge of the bathroom sink, she pulled herself up. She met her eyes in the mirror and saw her cheek was a deep purple bruise. She blinked back more tears which threatened to overflow much like the bath. She tugged off her dress, wincing as it caught the cuts and bruises that plagued her body. Standing in front of the mirror in her cotton undies her twelve-year-old body was barely recognizable under the absurd colouring her father’s beatings had left her with. She had a young girl’s figure and a child’s knobbly knees but her face and body showed more pain than adults five times her age had seen. Turning away from the ugly image before her she crossed the room and sunk into the bath. The warm water stung but soon offered relief. She sat there for what seemed like hours, but in reality was only a few minutes, staring at the bright white-tiled wall in front of her. Everything in the bathroom was so neat and tidy. Everything had its place, from the soap to the handtowel. You never would have guessed the owner of this bathroom was so out of control.
Update: Good point but nobody notices because her house is miles away from anyone elses. She doesn't have any friends at school, but that doesn't matter because her father hardly ever lets her go. He makes her stay home and take care of her baby brother. She wears long sleeves to hide the marks.
Update 2: She wasn't beaten inside the house. Sorry if that was unclear. She was reading down near the river behind her house when her dad yelled from the back gate for her to come inside. He met her at the back gate scolded her, slapped her and then walked inside. Penelope followed him in later, as she wanted to avoid... show more She wasn't beaten inside the house. Sorry if that was unclear. She was reading down near the river behind her house when her dad yelled from the back gate for her to come inside. He met her at the back gate scolded her, slapped her and then walked inside. Penelope followed him in later, as she wanted to avoid him, not giving his the satisfaction of seeing her eyes brimming with tears.
Update 3: Lolita - Thanks for that. Whoops. It was a typo and should say steam.
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