Just be cautious with this as the plan...the view on liquid assets seems to be hit or miss (some consider them, some don't and may require a joint sponsor regardless).
Yes. Make sure you continue to maintain or establish proof of domicile (pay US taxes, maintain US driver's license, US bank accounts, etc) before she files; also have a joint sponsor lined up.
Proving domicile, or intent thereof, is possible from out of the country. I lived in Peru for years and years and was able to remain with my spouse for the entire time throughout the entire process. It is possible.