Hi, i got some more info...

-->Passengers are supposed to have return tickets on a Qatar Airways flight in order to get a visa

-->Note that passports must be valid for six months after the date of return. Exit visas are not required

-->She can give her friends or relatives valid address at the Imigration Counter.

-->Should carry a VISA/ MASTER CARD for the payment at Immigration desk for the VISA on Arrival

I hope this is it...