Post 817 in this forum describes how to search the John Adams Comstock book on line and free. Searching there for "Capps" I found nothing. Sorry. Is it possible that Libbie Comstock wasn't born a Comstock but married a Mr. Comstock? If you have time and patience, you might search the John Adams Comstock book for every woman born a Comstock (or maybe marrying into the family and being widowed or divorced) and given the name Elizabeth, Libby, Lizzy, Libbie, etc., possibly as a middle name, and born around the right time. I think that's a long-shot though, since "Capps" is not in that book.