My Question01: Is it possible to Change her tourist visa to Family Visit Visa Without Exiting Qatar ??

Yes, Possible... But very very difficult...You need special approval from Captain at the Immigration department...Usually they will advise you to go out of Qatar and come back.

My Question02: Can i apply for Family Visit Visa while she is already in Qatar (on tourist Visa).

Yes, Possible... But your Visa Application will be Rejected. ...After rejection , you need to go there and speak to the captain....You need special approval from Captain at the Immigration department...Usually they will advise you to go out of Qatar and come back.