Go West, Young Girl (1978)

"They've taken off their petticoats and strapped on their guns. Now they're after Billy the Kid in the funniest frontier free-for-all ever!"

A lighthearted Western about a peppery New England lady who goes west to seek her fortune by writing about her experiences, and the attractive widow of a cavalry officer, both of whom go in search of Billy the Kid, teaming up to outwit gamblers, bounty hunters, and rough-and-tumble lawmen.