There is some conjecture that this 'Jane Mercer' is, in fact, one of the youngest-ever female impersonators, namely Dudley Manlove (better known later for appearing in Ed Wood's Plan 9 from Outer Space).
Mentioned in Los Angeles Evening Herald (with Photo) from September 18, 1918 as Tiny Jane Miskimis. She take part a street carnival and Dance Programm what was staged by Jewish Womens Auxiliaries. She is described as 7 years old and recently came from New York to Los Angeles.