As per the facts, your sister cannot perform the second marriage during the subsistence of the 1st marriage, because the second marriage during the subsistence of 1st marrige is an offence of Bigamy under IPC.
Because the marrige of 1st husband is not disscolved by way of divorce decree/ judgment by a competent.
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1. your sister can file a contested divorce case on the grounds of cruelty, desertion, separation
2. in case, he doesn't appear, she will get the ex parte decree and can remarry after obtaining the decree and lapse of the appeal period
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