@Laurel G. I grew up in San Diego, went away and am back again. In the meantime, Pacific Beach has moved more and more people in without doing anything to help them get in or out. Your daughter will either be late to class/work everyday or spend whatever free time she has in the car going to and from home. But I love Pacific Beach. Don't know much about UTC except if your daughter is doing her residency in La Jolla, traffic is horrible.
Just know, in general, morning traffic is worse heading west and north. Opposite is true for evening traffic. Into downtown or the "valley" (Mission Valley/Fashion Valley), traffic stinks from all directions.
My personal opinion...choose a location based on your daughter's residency...close by. Her hours will probably be long and hard and the last thing she needs is a long commute to/from home. Minimize commute to maximize her down/free time (and safety). Of course, this would depend on the area being "nice"!
Then think about whether or not she should buy or not. Either way, she should have no problem getting a roommate from the residency program if the distance home is nearby.