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Re:A 2:15 Alarm, 2 Trains and a Bus Get Her to Work by 7 A.M by rbcgerard on Thursday August 17, 2017 @02:08PM (#15039249)
I think the answer is she's making a choice based on her preferences:

1. Live and Work in SF make $80k, and live in small expensive housing

2. Work in SF and make $80k, live in Stockton and get more and pay less for a house, and spend a ton of time commuting

3. Live and Work in Stockton, make way less, live in a place larger than SF but Smaller than #2 and not have to commute

She chose #2 - others make different choices

Re:A 2:15 Alarm, 2 Trains and a Bus Get Her to Work by 7 A.M by spiralpolitik on Thursday August 17, 2017 @03:04PM (#15039820)
For (3) you are of course assuming that there is a job in Stockton for her skill set.

There may not be which makes option 3 an non starter.