Robert A. Heinlein "Menace from Earth."
"Menace from Earth" puts you inside the mind of a gorgeous teenage girl, born and raised on the moon, whose greatest desire is to design a starship - and she is well on her way with her brainy male teen colleague, with whom she thinks she has a sister-brother relationship...that is, until a beautiful older female (the menace from earth) starts leading him around by the nose.
This is a short story, but is like a little diamond - worth far, far more than you could imagine until you have experienced it. There are seven other short stories by Heinlein in the book, and they are all good; but the only one I have remembered since I first read it 48 years ago is "The Menace from Earth."
ASIN: B00005WFDT.
SIGNET BOOKS, First Edition. 1962.
Used book. Slightly yellowing edges of pages. Minor shelf wear from rubbing. Otherwise, like new inside.