1.- Ask HR for grade and positions
2.- Grades are pretty much attached to salary packages so once you get tha grade you will get the salary.
3.- You will either get housing in Al Khor or in Doha. (Some people prefer to ask for the money and rent on their own)
4.- Car loan will be repaid on the duration of your contract. If your contract is "indefinite" then most probably you will have to set a limit to repay the loan (or the company will give one time limit). By the way to get the car loan you will need a quotation and you will get the money based on car cost and policies. If the car costs less than the total amount given to you in loan then you will get enough to get the car not the full amount.(so no savings...sorry)
5.- Education allowance is in the policies (once again ask HR what is the basis for calculations and expenses covered) For fees structure in ASD go to
http://www.asd.edu.qa
6.- If you are related to a project you could be working six days a week (sat to thu) or five days a week(sun to thu)either in Ras Laffan or in Doha.
7.- Yes you get sick leaves (policies, ask HR) and also you get annual leave (again HR)
8.- Plane tickets and days off are given based on policy for annual leave (ask HR, and plane tickets are Based on IATA fares)
9.- Do a little research in companies web pages or in job sites like monstergulf.com or bayt.com
10.- If she is qualified enough and she finds an opportunity here yes she can work provided all the paperwork is right.

Hope to be clear on answers and comments

Regards!!