I really like our pediatrician who is located on the border of Rancho Bernardo and Poway. I think his address is Poway, but across the street is RB, so pretty close.
His name is Robert Barr. He is in a practice with one other doctor, though they share office space with a larger group (i.e. share receptionist, etc.) I have found him to be very supportive of breastfeeding and delaying vax, and he is always very interested in talking through medical decisions. I have never ever felt rushed during an appointment and the office *always* takes us on time or within 10 minutes of our appointment. I

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Phone number: 858-673-9270.
Sorry I can't help with the other two. MY OB/GYN is in La Jolla (I love her, though) and I don't have an internist.

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Best to your sister. Have her PM if she's interested in other stuff around the area. We moved to SD from the east coast a few years ago.
Sharon