The feeding cycle should go from the start of one feed to the start of the next. So if she feeds at 7am and is on a 3hrly, her next feed should be around 10am.
While some say don't wake a sleeping baby, it is important to get the right number of feeds in during the DAY time. Around 4-10 weeks a lot of babies get their days and nights mixed up and want to sleep during the day. And then they're up all night. So you're doing good to keep her eating during the day!