Adult Women Only--Do you read or are you a writer? I need your opinion on something that I find very unrealistic.

Adult Women Only—Authors, writers, journalists!

I am reading a book from Dean Koontz. In the story, a woman in her 40’s kidnaps a boy in his teens. She approaches him from behind and covers his mouth with her hand to keep him quiet from the neighbors.
I am a writer and I pay lots of attention to detail. I find this quite unrealistic since a) women have small hands and b) women are weaker than boys.

Do you think it is realistic that a woman’s hand is big enough to cover a boys mouth with her hand to keep him quiet? How close to his nose might your hand come? Do you think the boy would be forced to smell her hand against his will if she kept him quiet? His nose and mouth are a quarter of an inch apart. Explain your answer. Is your hand small or adult sized? The 13 year old boy is described as 5’1 and 101 lbs.

So if you’re a female author or writer, I would like your opinion. Thanks for reading my question:)