you could have offered it as a favor to her, for insurance purposes.
"Don't worry hon, let me take care of this for you. Your insurers, and probably my neighbor, will need these pics. Now, just give me your phone number so I can get these to you after I get them developed."
You're older--just feign ignorance abour digital cameras or the internet and tell her that this is a film camera, and that you'll need to meet up later to drop them off.
If that doesn't work, you could always offer to staple some papers for her.