Thank you for rescuing photos. I've just started doing that myself. It started when visiting an antique shop that had two boxes of old photos advertised as "Instant ancestors." It kills me to see that and I bought 7 pictures that have identifying information and have located one so far.
Anyhow, my late husband's Lapham family was from Scituate and Marshfield MA and some of them went to Salam but not our direct line. There are not that many Lapham families and I have a book of the early ones. I'll see if I can add any more info to help identify Mable. I'd be interested in seeing the picture if you have a scanned copy.