What is california's labor law regarding maternity leave. Do I have to provide compensation for it and if so what is the standards?

There is no requirement that the employer pay the employee during this time.

Here's some info:
http://www.dfeh.ca.gov/Publications/DFEH%20100-20.pdf
http://www.dfeh.ca.gov/Publications/DFEH%20100-21.pdf

If the employee is unable to work due to pregnancy complications, she may be eligible for state disability insurance benefits or paid family leave (a component of SDI):

http://www.edd.cahwnet.gov/fleclaimdi.htm
http://www.edd.cahwnet.gov/fleclaimpfl.htm