I'm always thrilled to find illustrations done by women (like Elenore Abbott), but these are not only done by a woman, but done to illustrate books written by a woman. Yay girls! The books are Shake-speares Sweetheart and A Lady of King Arthur's Court by Sara Hawks Sterling (about which I could find no information), published in 1905 and 1907, respectively. They were illustrated by Clara Elsene Peck in a delightfully Art Nouveau-ish manner.
Scans from Golden Age Comic Book Stories