 What is not a reason for Matilda to tell the librarian what happened?
The fact that in all probability such a man did not exist disturbed Matilda not in the least. She would read them carefully and then read them again, looking for the masculine names which, through a system known only to Matilda, had an affinity to her own. The first thing the widow Penshaws did was to take Matilda's left hand in her own and examine the next-to-the-last finger. Matilda switched her bed lamp on and dabbed some citronella on each ear lobe and a little droplet on her chin (how she hated insects!). Someone in Nebraska wanted to trade match books; someone in New York needed a midwestern pen pal, but it was a woman; an elderly man interested in ornithology wanted a young chick correspondent interested in the same subject; a young, personable man wanted an editorial position because he thought he had something to offer the editorial world; and— Matilda read the next one twice. Cedar Falls was a small town not fifty miles from her home, and she'd get there a hop, skip, and jump ahead of her competitors, simply by arriving in person instead of writing a letter. Matilda got out of bed at seven, tiptoed into the bathroom, showered with a merest wary trickle of water, tiptoed back into her bedroom, dressed in her very best cotton over the finest of uplifting and figure-moulding underthings, made sure her stocking seams were perfectly straight, brushed her suede shoes, admired herself in the mirror, read the ad again, wished for a moment she were a bit younger, and tiptoed downstairs. Then the widow Penshaws told Matilda that she could never hope to sneak about the house without her mother knowing about it, and that even if she were going out in response to one of those foolish ads in the magazines, she would still need a good breakfast to start with like only mother could cook. Once, she told herself: Matilda Penshaws, you are being premature about the whole thing. First place, I don't know any Haron Gorka—" Matilda kept the alarm from creeping into her voice. It turned out that no one did: Matilda tried the general store, the fire department, the city hall, the high school, all three Cedar Falls gas stations, the livery stable, and half a dozen private dwellings at random. The librarian seemed about to soar off into the air someplace, and if five women had been here first, Matilda was now definitely in a hurry.
 she wanted to make sure the librarian stayed away from him
 she had been asked to relay a message to his wife  she wanted to tell someone her crazy story  she wanted to make sure the librarian stayed away from him  she had made a promise to return