I am happy about your mother's friend's planning. I have shared some information about this place. San Francisco is a city in California. It is very famous for its beautiful attractions and its food points. All the attractions are not bad but the most famous is Golden Gate Bridge. Anyway, I have shared some restaurants in this city. There are:
House of Prime Rib
Kokkari Estiatorio
La Taqueria
Mandalay Restaurant
Balboa Cafe
Copra
If she go there so must try all of these restaurants one by one. She goes there so must take the camera with you and enjoy photography. I hope she likes my information. she comes back on this tour so must share here her experience. I will be waiting for a response.