I couldn't find any lyrics, but this information might interest you:

A database of women song composers compiled by Christopher Reynolds of the University of California, Davis lists these songs composed by Estelle Philleo:

AWAY OUT WEST IN WYOMING, lyrics by Estelle Philleo, published by Wells Music Co. (Denver, CO), 1925.
COLORADO, lyrics by Estelle Philleo, published by Wells Music Co. (Denver, CO), 1923.
COLORADO CABIN, lyrics by Estelle Philleo, published by Baldwin Piano Co. (Denver, CO), 1930.
COLORADO COLUMBINE, lyrics by Estelle Philleo, published by Wells Music Co. (Denver, CO), 1920.
DESERT DAWN, lyrics by C. Ernest Cadle, published by G. Schirmer (New York, NY), 1930.
FARTHER WEST, lyrics by Roscoe K. Stockton, published by Forster Music Pub. (Chicago, IL), 1921.
HOME AGAIN, lyrics by H. Van Dyke, published by M. St. Vrain (Chicago, IL), 1919.
IN OLD TUCSON, lyrics by Charles Bechtold, published by ??
MEADOW LARK SONG (NO MORE TROUBLIN'), lyrics by Roscoe K. Stockton, published by Carl Fischer, Inc. (New York, NY), 1927.
ONCE I MET HAPPINESS, lyrics by Margaret Widdemer, published by B. F. Wood Music Co. (Boston, MA), 1924.
OUT WHERE THE WEST BEGINS, lyrics by Arthur Chapman, published by (self) Estelle Philleo, 1917.
ROUNDUP LULLABY, lyrics by Charles Badger Clark, published by Forster Music Pub. (Chicago, IL), 1919.
TRAILS, lyrics by ?, published by Forster Music Pub. (Chicago, IL), 1920.