One possible story could be that she is part of a magic show. The magician uses the tied mask as a prop for an escape trick. The girl is a volunteer, and the gagged mouth adds to the mystery and drama of the performance as the audience watches in anticipation to see how she will free herself from this situation.
There was a girl who loved exploring forests. One day, while exploring a new and uncharted forest, she got lost. She stumbled upon a strange group of people who were performing some sort of ritual. They thought she was an intruder and to keep her quiet during their ritual, they tied a mask around her mouth, gagging her. The girl was terrified at first, but then she remembered her survival skills. She managed to break free when they were distracted and ran as fast as she could to find her way back home.
One possible story could be in a mystery or thriller context. Maybe the girl is a witness to a crime and the criminals tie her up and sock - gag her to keep her from screaming or alerting the police. Then, a brave hero comes along to rescue her.
Perhaps it's part of a prank that has gone too far. Some irresponsible people might think it's funny to play such a cruel 'joke' on her without realizing the seriousness of their actions. However, this is still a very wrong and illegal behavior.
One possible story could be a mystery or thriller plot. Maybe she was kidnapped by a villain who used the tube sock to gag her and tied her up to keep her from escaping while they searched for something she had. It could also be part of a role - playing game in a fictional adventure where she was captured by 'bad guys' in a make - believe world.
It might be a horror - themed story. The girl is tied and gagged, perhaps by some deranged person. The treadmill could be part of a sadistic plan, like she is forced to be near it for some psychological torture. The story could then be about her struggle to escape this terrifying situation.
In a more action - adventure context, perhaps the girl is a spy who has been captured by the enemy. The tying and gagging on tiptoes is a form of torture or interrogation technique. But she is a strong - willed character, and she uses her wits and any available resources around her to outsmart her captors and escape.
One possible plot could be a mystery thriller. The girl is tied and gagged during a webcam session, and it's part of a ransom situation where the kidnappers are using the webcam to send messages to her family for money. Another could be in a horror context, where she is a victim of a deranged person who likes to terrify his victims on webcam.
If it's safe to do so, you can try to untie her gently while waiting for the police. But make sure not to destroy any evidence that might be on the ropes or gag. You can also talk to her softly to keep her calm.
There was a girl, Emma. She was in a park when some bad guys came up to her. They tied her up tightly and gagged her so she couldn't make a sound. They robbed her of her jewelry and phone. She felt so helpless. However, she remembered that she had a small tracker in her bag. Her family used it to find her location. When they got there, they saw the robbers and called the cops. The robbers were arrested and Emma was safe.
However, if the story is written with malicious intent, such as to objectify or promote violence against women, then it is clearly unethical. Writers have a responsibility to use such potentially disturbing elements in a way that is socially and morally acceptable.