Walker may also have been consulted .
Walker may also have been included in a receipt book written by Mary Rich , Countess of Warwick , and her sister , Lady Katherine Ranelagh , though it is difficult to discern what she wrote or influenced .
Walker may also have been consulted or included in a receipt book written by Mary Rich , Countess of Warwick , and her sister , Lady Katherine Ranelagh , though it is difficult to discern what she wrote or influenced .