Babysitter Rates

Hello! I have a quick question about babysitting rates… I have a sitter who does about 5 hours with us, 7am to 12noon, and pay her $30/hour. The job is pretty easy since my baby sleeps until about 10am, will have milk after and then naps again around 11am. But now I’ll be starting to need her from 7am to 5pm… which means more things to do because my baby is usually awake in the afternoon (will wake up from his nap around 1 or 2pm and that’s it, no more nap) and will play and will have to be fed lunch and some snacks. They will be staying at home, no going out for walks, etc. Since it’s more work than before, do I have to pay her more? First time mom, so clueless.