Log in with 2-step verification, but no longer have this number

I have a Google Account that contains over a thousand photos of my daughter who was killed last year at the age of 23 years old. My reminder number was that of a friend who died around the same time. I know the password but I can not go beyond the two step verification. I can not express how important these images are to me. Helpers help me solve this problem.
Thank you. Michelle (Shelley) (