DD (14) has been asked to do some occasional babysitting in the evenings for our next door neighbours 5 and 7 year olds. They've asked what she'll charge and I'm not sure what's reasonable. We are not in London but in town in SE. We are friendly neighbours so it's not a close friendship but also not strangers. We'll be nextdoor as back up if there's a problem.
What seems a reasonable rate for that?