I am looking for a book I read back in the early 70s – the book could be from the 60s. It was about a young woman who takes a job as a “nanny” on a cattle farm East of San Francisco, for two young girls who lost their parents. An old woman with a broken leg lives in the house, there are two Aunts to the young girls living there, one is named “Beryl.” There are two hired men who work the cattle farm. There is something suspicious about the old woman and the hired men, as if they are plotting to take over the farm. There is a “maid” who is not very good at her job and this “nanny” title role character ends up taking over the cooking duties as well. She ends up falling in love with one of the hired men and the old woman and the other hired man are arrested for crimes, and the “nanny” and the “good” hired man take over the farm and raise the two young girls at the end. The plot takes place in the Summer as the book always talked about how hot it was. I remember the old woman, along with the two young girls,  originally picked the “nanny” up in San Francisco and they ate a meal on Fisherman’s Wharf before departing for the ling car trip to the farm.