Report it to police that she left your home without your notice and now she do not want to come back and also threaten you with case. so they should not tell you later that you kicked her out.
If she took any of your valuables that also write in clear drafted letter and do not forget to make a copy and get it signed by Police
File for Restitute conjugal rights and also for Child visitation.
She can ask for maintenance from you for her and child, but you can deny if you prove she left her own, find such judgments here http://mynation.net/docs/sitemap/