Dear Querist
No need to worry, presently, the arresting in the dowry demand case(498A) cases is not mandatory as per Supreme Court Judgment.
if she filed any case U/s 498A of IPC against you and your family members then the Police shall not registered the FIR Directly, first of all, after receiving the complaint from her, the police refer the matter before CAW/Women Cell and they tried to settled the matter amicably, if settlement is not possible, and she is adamant to registration of FIR then the police registered the Case as FIR.
after registering the FIR, then written permission of the DCP/ACP of Police is mandatory, presently, arresting permission for In-laws is not given by the superior Police officers, hence there is no question of arrest of your mother.
when you got the information regarding the registration of FIR, then immediately file an anticipatory bail U/s 438 of Cr.P.C. before Session court or High Court through your counsel and your personal presence is not required for that.
Apart from this you may file a divorce case against her before the Family Court in India through Power of Attorney Holder who may fight the divorce case on behalf of you.
Apart from the above, if you want to take precaution then you may send some information cum complaint(non-actionable) before the police officials and other govt. departments with all your apprehension and her attitude and cruel behavior.
Feel Free to Call