Married filing separately

This is the first time I’m considering this for a couple of reasons: 

 

1) I currently have a past-due child support.

2) I have a single-member LLC with only $600 to report.

3) I have no W-2 income

 

My wife is the bread winner with her W2 income however I’m afraid her refund will be taken by the child support arrearage and I want to avoid this. Will filing separately be more appropriate than filing jointly along with injured spouse form?