Louisa Vance ^{1 3}

  Things to check:

The 1900 US census says she's the mother of 5 children, 4 of whom are living -- but only lists three children. The 1910 census says the same thing.

The 6 Apr 1918 Arcadia Tribune (Arcadia, California) has this gossip item:
"Mrs. C. A. Rouleau of Los Angeles spent the week-end with Mrs. W. R. Slater."

The 20 Apr 1918 edition of the same newspaper has this item:
"The Misses Helen and Minnie Cosibella and Mr. Dewey Rouleau spent Sunday at the home of his sister, Mrs. W.R. Slater. In the evening the party motored to Venice."

Is Mrs. W.R. Slater the missing child? ^{1 4}

  In her life:

• In 1900 Louisa lived at 850 Howard Street in Los Angeles, Los Angeles, California. ¹

• She was counted in the 1900 US census for Los Angeles, Los Angeles, California. ¹ ED 83, SD 6, Sheet 14A, ward 8.

• In 1910 Louisa lived at 717 Howard Street in Los Angeles, Los Angeles, California. ⁴

• She worked, in 1910, as a dressmaker from home in Los Angeles, Los Angeles, California. ⁴

• Louisa was counted in the 1910 US census for Los Angeles, Los Angeles, California. ⁴ ED 64, SD 7, Sheet 3A, precinct 19.
Enumerated as Louise.

Louisa married Amable Rouleau, son of Charles T. Rouleau, Sr. and Therese Brunelle, about 1888.^{1 2} (Amable Rouleau was born in August 1849 in Minnesota Territory ^{1 5} and died between 1906 and 1910 ⁶.)