Blanche Horsefall (Stansfield) - mother and daughter

if mother Blanche Stansfield born 1578 so ive seen it said that would make it that Isabelle Horsefall could not be her daughter as Isabelle was born 1503 so this would mean that Blanche Stansfield could not be Isabelle Horsefall mother as she was born after Isabelle just wondering if it possible u have Isabelle Horsefall and Blanche Stansfield mixed up as Isabelle married Lawrence Stansfield