1. Well, though the complaint of 498A should be filed at the place of matrimonial home of the wife it can be filed by wife from her present place of residence from her parent's place of residence.The mental cruelty which gives cause of action of the 498A case does not have any fixed place of occurrence.
2.Now automatic arrest in 498A case has stopped.if FIR is registered you will get first notice u/s41A CRPC.On its receipt you can apply for anticipatory bail which is usually allowed.
3.Once AB is granted you can apply for regular bail immediately or after submission of charge sheet .
4.Do not worry.She will not be arrested all.Apply for anticipatory bail for your mother which would be allowed for sure and wait for regular bail only after submission of charge sheet.
THERE IS NO CHANCE OF ARREST.DO NOT GET BOTHERED ON THIS ISSUE.