Erna Meyer immigrated to British Mandate Palestine from Germany in the early 1930's. The information I have indicates that her book, indeed the first cookbook published in what is now Israel was first published in English in 1936 and then, some six years later, in Hebrew. I have been told that there was also a German language edition but cannot lay hands on or confirm that. If I had to draw a comparison in culinary pioneering it would be to Amelia Simmons who published her "American Cookery" in 1796.
Indeed her self-appointed task was in convincing women who did the cooking in nearly all homes and on the kibbutzim that the dishes to which people had become accustomed in Germany, Austria and Poland were not appropriate to the climate of the Middle East, being far too heavy to make for easy digestion in such a different clime. She stressed the use of local ingredients, those especially including olive oil, labane (yoghurt cheese), eggplant and low-fat ingredients. In an odd way perhaps, a predecessor of the Mediterrranean Diet.
The 1936 English language edition that I have was published by WIZO (the Women's International Zionist Organization). I also have a copy of her 1942 book, that in Hebrew, which was published by Shocken (a family that remains in the publishing business as well as owning HaAretz Newspaper for which I write). As to the recipes in the book, Dr Meyer wisely restricted herself to ingredients that were easily and inexpensively available. As a possibly amusing side-story, at public speaking engagements she encouraged people to eat olives for breakfast - startling for many European ingredients but now of course part of the breakfasts of many, many Israelis.
Interestingly as well, in her books, the cookery remains basically European in nature and spoke not at all to the foods of those Jews who were making their way to Palestine from North Africa. Only later did she publish pamphlets (again through WIZO) in which she became a strong advocate of the cookery of the Maghreb.
If you should want more information on this the two people to contact would be Claudia Roden and Joan Nathan, both of whom will almost surely have a good deal to say about the books and the person.
As to the second book, I have no information but will check with the antiquarian book dealer Pollack tomorrow and see if I have any luck.