1) There is no time limit about your filing a complaint under section 498A against the husband and in laws as the offence occurred recently. And besides you should not delay in the filing of the complaint. This can lead to the arrest of the husband and the in laws.
2) Secondly a complaint can be filed under provisions of Protection of Women Against Domestic Violence Act 2005 and your daughter can seek compensation for all the sufferings that she underwent,separate residence, protection etc.
3) Protection order is an order that the Magistrate will pass in favour of the aggrieved person(complainant). Let me quote the section 18 for your benefit "18. Protection orders.—The Magistrate may, after giving the aggrieved person and the respondent an opportunity of being heard and on being prima facie satisfied that domestic violence has taken place or is likely to take place, pass a protection order in favour of the aggrieved person and prohibit the respondent from—
(a) committing any act of domestic violence;
(b) aiding or abetting in the commission of acts of domestic violence;
(c) entering the place of employment of the aggrieved person or, if the person aggrieved is a child, its school or any other place frequented by the aggrieved person;
(d) attempting to communicate in any form, whatsoever, with the aggrieved person, including personal, oral or written or electronic or telephonic contact;
(e) alienating any assets, operating bank lockers or bank accounts used or held or enjoyed by both the parties, jointly by the aggrieved person and the respondent or singly by the respondent, including her stridhan or any other property held either jointly by the parties or separately by them without the leave of the Magistrate;
(f) causing violence to the dependants, other relatives or any person who give the aggrieved person assistance from domestic violence;
(g) committing any other act as specified in the protection order."