Married to a nonresident, noncitizen

I'm a US citizen, my spouse is from Taiwan (non US resident, non US citizen). We got married in TW this year. She lives in TW and has a job and income there. 

 

I have the following questions:

1. When filing taxes, can I file Married Filing Separately so her income does not get taxed?

2. If filing MFS, will she have to file a separate return or not? 

3. When she does move to the US, can we then switch to filing MFJ, so both our incomes are taxed in the US?

 

Thanks!