jeffries and her brother h. allen hays belonged to a prominent newbury park family which helped the town's commercial growth. she gave the successful low bid for a new post office in august 1966, thereby ensuring that the newbury park post office remained on newbury road. jeffries became a notary public and in 1963 the first woman president of the newbury park chamber of commerce. she owned a variety of local businesses, including newbury park auto salvage, newbury park lumber company, richfield gas station, jeffries garage, a storage warehouse, trailer park and a used car lot. her daughter susan donated fifty boxes of jeffries' letters, documents and newspaper articles to the conejo valley historical society.