So lets take a look at the vote totals from the last three elections in which Ms. Zamarripa has been involved.
2010 - 1,465 total votes - 755 for Zamarripa
2012 - 900 total votes - 599 for Zamarripa
2014 1116 total votes - 678 for Zamarripa
It seems that one could draw a couple of conclusions from the above data. JoCasta has done a poor job of building a voting base in her district, in fact she's decreased her Democratic base.
Since winning the right to redistrict the 8th & 9th Assembly Districts Ms. Zamarippa and Voces de la Frontera have succeeded in gerrymandering the districts to keep the voter turnouts low.
As a side note here's an inside look about the race from Robert Miranda (you'll have to scroll down a bit). It seems JoCasta spent about $20 for every vote she received. Even with Union support that's some serious cash.