"I thought she was with you: I don't wonder they call her Flyaway." "I don't know where she is, I'm sure, Miss Polly.

Won't you please pull my tooth! And do you 'spose I can keep my tongue out of the hole ?" "Why, Dotty, I thought you were going to take care of that child," said Miss Polly, dropping her knitting without getting around to the seam-needle, and walking away faster than her usual slow pace.
"There's nothing so bad for me as worry of mind: I shall be sick as sure as this world!" Dotty knew she had been selfish and careless.

She not only felt ashamed of herself, but also very much afraid that something dreadful had happened to Katie, in which case she would be greatly to blame.

She anxiously joined in the search for the missing child.

I am sure you would never guess where she was found.