My dses all have paper rounds - they get up early each morning, cycle to the village, do their rounds and get home in time for showers before school. At the weekends they can get up a bit later, but the saturday and especially sunday papers are really bulky and heavy - but even the 13 year old gets on and does it.
Dh and I are always willing to support them with their rounds, partly because we think it is a good thing that they are earning their own money and getting that bit of independance (plus learning to budget etc), partly because they are bringing money into the house, so that they can afford things we mightn't be able to afford for them, and partly because we believe they have a responsibility to their customers, some of whom are elderly and rely on them for their papers.
We have covered their rounds when they have been ill or away, driven them round in bad weather (when it was so snowy and icy last winter, dh drove them round their rounds every day for weeks). Dh often drives them to the paper shop at the weekends, and on sundays he drops stashes of papers round their rounds so they don't have to try to cycle with their full loads (which would be nigh impossible and dangerous).
Ds1 is hoping to get a weekend job too, and I know for sure that he will commit himself to it properly and won't let his employers down, any more than he lets his customers down.
Frankly, we would not let any of them let an employer down in the way that Angel's saturday girl is letting her down. We would drive him to work if the buses let him down, and chisel him out of bed if he'd stayed up too late on the Friday night. I suspect that this girl is going out partying on Friday nights and then pulling these sickies - if any of mine did that, they'd be getting a serious lecture from me, and a boot up the bum!
She needs to learn that a job is not a hobby, nor is it a right - and if she takes on a responsibility, she has to live up to it. If she treats her employers this way when she leaves school, she's going to find herself losing jobs and getting shit references - and she is not going to like the consequences of that.
Angel - I hope you can get this sorted out and either get her to buckle down and do the job, or find someone more responsible.