Green’s Dictionary of Slang

(US) a young woman.

1885		Bulletin (Sydney) 13 Jun. 18/4: He was a bit of a favourite with both sexes, but more particularly with the gazelle division, many of whom would darn his socks for less than the asking.
1929		Dayton Herald (OH) 18 Apr. 28/2: ‘Well, for a gazelle with the gimmies like she has, an’ hollow legs herself for the dear ol’ hooch’.