She was forced to stop mid-stride as her slippers were impaled by long toenails pushing out through the front. Her finger nails, short and clean, were elongating like claws.
She noticed that she was getting taller. There were already several inches between the bottoms of her pajama pants and her feet, and the gap between her shirt and pants was growing larger as she watched.
The changes to her body accumulated slowly. She felt the pressure around her feet increase until the slippers split across the top, revealing larger feet with long, curving nails on each toe. She grew another few inches as her pajama bottoms split down the back of her more mature calves and up the sides of her thighs. Her legs looked plumper than she remembered.
Her shirt was not doing any better. She had already lost most of her buttons up the front as her rib cage and shoulders widened under the thick cotton top. She felt the long sleeves split up her arms and shoulders before the final button gave way.
There was a second of pressure on her hips as they thrust out sideways, snapping the elastic bands of her pajama bottoms and underwear, leaving her naked except for the ragged remains of her top that hung about her shoulders. She held the shredded tatters in a shaking hand, before dropping them to the floor, near the rest of her ruined kid-sized clothing.
Looking in her bedroom's full length mirror, she saw that she now stood almost five and a half feet, her tomboy frame replaced by a much taller and curvier person who still had her eyes. She even recognized her face, though it was longer and her cheekbones were wider.
There was thick black hair on her groin and under her arms. Walking over to her bed, she sat down, and tried not to hyperventilate. She grasped the wooden footboard of the bed and focused on slowing her breathing. Slowly, she felt her breath coming in smaller and smaller gasps. Relaxing her grip on the footboard, she was alarmed to see that she had nearly broken the thin wooden plank with her stronger adult grip.