Here is the source for her marriage to both husbands, William Boteler and William Poole. This is important because the second husband is William de la Pole (Poole) who is a member of the FitzWarin family of Wales. Geni currently has her sister Elizabeth as also joined to the FitzWarin family.
https://histfam.familysearch.org//getperson.php?personID=I1819&...
This Isabel Harrington is recorded as married to Sir John Boteler, and then William de la Pole (Poole). I think these are two different people living about the same time and one a Haverington and one is Harrington. I am researching the de la Poles, so would like to get a profile created for Elizabeth Harrington.The have different parents if you look at the link.
