its simple.. just go to airport immigration office.. and submit the application which you can get from there it slef and attach your pp copy and sis;s pp copy which may both shows the same family name or fathers name.. ( to confirm she is your sis) and u can get here here for one month and you can extend the visa she can get work visa if she is said bye to gulf befoere 6 months ,, not 2 years like in qatar,.. 2 years only in qatar .. unless she didnt cancell her visa..
see yah