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.
Perhaps she has uncovered a big secret in a corporate or political conspiracy. The people behind the conspiracy don't want her to expose them, so they tie and gag her on her tiptoes to keep her silent. They may be planning to move her to a more secluded place later to deal with her more permanently, but she might be rescued by an unexpected hero who stumbles upon the situation.
Perhaps it's a mystery story. The girl is found tied at her tiptoes in an abandoned building. Detectives start to investigate, and they find out that she was kidnapped by a criminal who was trying to send a message to someone. As they dig deeper, they discover a web of secrets and lies that led to this strange situation.
No. It could be a consensual part of a performance art piece. The girl might be an artist expressing a certain concept through this extreme physical state, like the idea of restraint and the struggle for freedom in a symbolic way.
One possible plot could be that the girl is an acrobat in training. She is tied on her tiptoes barefoot as part of a special training routine to improve her balance and poise. Her coach ties her in a safe and controlled way, and she endures this difficult training to reach her goal of becoming a great acrobat.
Let's say in a fictional adventure story. The girl who is tied and gagged on her tiptoes is in a strange land. She was exploring an ancient temple when she was captured by some sort of cult - like group. They tied her up in this way as part of their strange rituals. But she is a brave girl. She manages to free herself a little bit and leaves clues for her friends who are also adventurers. They then follow the clues and come to her rescue, and together they defeat the cult - like group.
It could be a story about a girl who is in some kind of distress. Maybe she's been captured by villains and they tie her on her tiptoes as a cruel form of restraint. It might be a thriller - style story where she has to find a way to escape this situation.
One possibility is that it's a story of survival. The girl might be in a natural disaster situation, and for some strange reason, she ends up with her tiptoes tied. She has to use her wits and strength to free herself and survive in the harsh environment.
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.
She could be a princess who has been kidnapped. The villains tie her tiptoes to prevent her from running away while they wait for the ransom to be paid.
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.