How can I get free DNA testing and results in California . So I can find out if she's really my daughter.

Not going to be free, unless the other parent is going to agree to pay for it.

You can do a non court test if the other parent agrees and just have one done at a local lab. But someone has to pay for it.

Normally you will petion the court for the DNA test and do it though a court approved lab.

Oh OK thanks chuck

This site will tell you:
http://www.dnacenter.com/locations/california.html
Good luck!