Safe travels for your mother. Yes, this should be a very easy connection at SFO, all airside within the G section of the International Terminal. G is a very nice, modern terminal with lots of natural light, shops and dinning choices. If she wants to go for a bit of a walk, she can stay airside and go to next-door Terminal 3, which is also very nice. There's an airside hallway to T3 just to the left as you approach security in International-G.