I think all of you that pay so well are so wonderful!!!
My daughter is a teen and she pet sat our neighbor's multiple animals on many different occasions. Usually for a week at a time and medications were often involved. She never made more than $20 for a WEEK, and usually it was $10. The neighbor stiffed my daughter twice so we had to end the pet sitting relationship. I'm sorry, but how uncool to stiff a teenager! Alas, sadly it also ended our neighbor friendship, but we were not going to let our daughter continue to be taken advantage of.
I wish my daughter had been compensated so well. OP, how wonderful for your daughter -- don't feel guilty!