Shulmu gyllenhalls,
The best work available on Lamashtû right now is: Lamaštu: An Edition of the Canonical Series of Lamaštu Incantations and Rituals and Related Texts from the Second and First Millennia b.c., by Walter Farber, which is available on AbeBooks, Amazon, and elsewhere.
What are you writing? If we can be of any help, don't hesitate to ask.