Hi Dorcas, One way to tell if Jennie is the same person is to request a copy of her obituary. There is an obituary volunteer at Random Acts Genealogical Kindness. Go to raogk.org Choose Oregon Click on L thru M Scroll down to Lane Co. & choose Jessica.
Contact the Oregon Genealogical Society, oregongenealogicalsociety.org/ and ask if they have access to death certificates.The State of Oregon is very restrictive about who can order a copy. Succesful Searching!