Spouse and I live in different states

Hi,

I live in Texas and my wife lives in California. I haven't earned anything outside Texas and my wife hasn't earned outside California. Both of us rent in our respective states and don't own any property.

 

1. Can we MFJ (married filing jointly) for federal and then my wife MFS (married filing separately) for California?

2. For my wife to MFS in California can she just do a mock federal return using only her income and then file state tax with only her income? Or does he have to do something different ?

 

3. When filing CA state tax which federal income should be reported and should my wife include both the joint and mock federal returns in her state filing?

4. Can the state tax filing be done online or do we have to mail in the documents in our case?

It is confusing because both TX and CA are community property states. We have not lived together nor have property and TX doesn't require filing state tax. 

Please help.