Personally I think it would be a bad idea to force her to get a job. Working should be something she wants to do, to gain indipendance, become a responsible adult etc. I can understand your reasons (job references, experience etc) but if she doesn't want to be there, it sounds like ot could be more detrimental, kwim? If she isn't turning up for work or has an attitude her references might not be so good. Year 11 does need a bit of study time, year 12 even more so. If she wants and can handle getting a job at this stage I think it's a great thing, but I think you'd be overloading her by making her get one.