What can a 13 year old girl do to get some money? please read?

You can see if your parents have any elderly friends or even if you have your grandparents still, and see if any of them will pay you do to house work on a regular basis for them. That why if they aren't strangers you won't be so shy and they might even pay you better since you're being resposible. You can also offer to do yardwork if you like to be outside. Maybe not mowing or big things, but rake the leaves/pull weeds. I always did that for some spare money. Plus the dog walking/ grooming is a good idea above me too! Good luck!