If I remember right my mom paid us on piece work. We had regular chores that we were expected to do without pay, but if we wanted money we had extra things to do. Like so much for a load of laundry etc. My dad had to wear dress shirts so we got .25 a shirt for ironing (hey it was the 70's .25 wasn't bad) you get the idea anyway. You could set up a pay rate for different jobs and she can chose what she wants to do for each job.
My first "car" was my dads old pick-up too, but had to share it with 2 older sisters. Sure was glad when they moved out so it was all mine :)
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France