Mr.Kumar.you can renew rp of your family in advance,even 4 months in advance.only problem(may be)she have approval or not? ie.,normaly family visa approval is for 5 years,you have spent 5 years,so you have to get again approval.Do one thing.make papers and go to main office,get number and go to counter.if you dont have approval they will inform you and you have time to do that.if you have approval, they will renew it from the date of expiry and you have nothing to lose.She can go to India and stay up to one year.if she return before 6 months it is ok, other wise you have to go to Airport immigration and get the extantion more 6 months after paying fees.But you have to show good reason with proof and you have to go airport immigration before 6 months finish.
in case if somebody finish 6 months out of qtr and have valid rp, airport immigration is giving extention for limited period,you have to show good reason with proof and confirmed tkt to qtr.for family member fees is 500 qrs each for extention.

good luck