Southern Baja is probably much safer than the US. In the event of a problem, help is often a long way off and justice isn't dispensed in a manner we're accustomed to. We've been to mainland and Baja a bunch of times and never got robbed or had any serious issues. Most all the locals and travelers we've met have been very nice. Speaking passable Spanish helps immensely.
Most of the major surf spots in Baja are now populated year-round by gringos so there may be safety in numbers there. If I were you, I'd avoid the popular surf spots and go for deserted spots away from pueblos because drunk horny surfers can be more of a threat to a single gal than the locals
. Always be aware of your surroundings. Only surf where you can have a good view of your van from the lineup (so it's there when your session is over). Don't tie the dogs up. Most locals are scared of big dogs.
I would bring something like a shovel, baseball bat, or machette to use as a weapon if you find yourself in a bad situation.