Why would Hillary go campaign some more in California??? Why:??
The more Hillary campaigns, the more her poll numbers fall. The more people see of Hillary, the less they like her, and her support drops.
She should stay away if her goal is to win the state.
Honestly if she's still in the race a week from today I think she will lose to him. People are sick of her and as you point out she, herself, just might be doing her own cause more harm than good when she shows up and says the stuff that she says, in the way that only she is capable of saying it. JMO.
In 2015 (right about the time Hillary did that "Scooby" bus tour of Iowa), I said she may be just too old to be President--she has yet to demonstrate being hale like Ronald Reagan was in 1980 (remember all those pictures of Reagan working on the his ranch near Santa Barbara, CA?). It appears that the Democrats are now really regretting supporting her increasingly for this reason, in addition to the fact she attracts scandal like a magnet....