If DOMA is repealed, it is very possible that you could petition for your girlfriend, either in CA or by moving to another state that recognizes gay marriage. However it is not possible to say for sure at this time. If and when DOMA is repealed there will be a period where USCIS will state their stance on such cases and there will likely be a number of court cases before the dust settles.
A marriage must be valif in the place where the marriage take place and must not be void in the place where the couple resides. So state law will come into play on the subject as well.
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Possibly. Though you might need to move to a state where you can get married.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.
Immigration law so far has not recognized gay marriage. Even if you move to another state to marry, you will likely be denied of immigration benefit. You should consult an immigration lawyer to figure out if any other immigration benefits apply to you now.