Stargirl from Stargirl by Jerry Spinelli
“She was illusive. She was today. She was tomorrow. She was the faintest scent of a cactus flower, the flitting shadow of an elf owl. We did not know what to make of her. In our minds we tried to pin her to a corkboard like a butterfly, but the pin merely went through and away she flew.”
and TheRoommate as… The Great Kate Weather Machine (Kate Wetherall) from The Mysterious Benedict Society by Trenton Lee Stewart
“That was close,” Sticky said. “But now what? There’s nothing else to tie him up with.”
“How about this rope?” cried a familiar voice, and to their surprise Kate Wetherall suddenly leaped in through the open window.
And just so you understand the great attention to detail in her costume…
“I’ll show you,” Kate said, and began removing things from the bucket. First came a Swiss Army knife, a flashlight, a pen light, and a bottle of extra-strength glue, which Kate examined to be sure its lid was tightly closed. then she produced a bag of marbles, a slingshot*, a spool of clear fishing twine, one pencil and one eraser, a kaleidoscope, and a horseshoe magnet, which she yanked with some effort from the metal bucket. I’ve been through dozens of these,” she said, holding the magnet up for them to admire. “This is the strongest I’ve found.” Finally she showed them a length of slender nylon rope, coiled around the bottom and sides of the bucket. -The Mysterious Benedict Society
*We tried. We were unsuccessful. Seriously? Where do you go to pick up a slingshot these days?