Do they have longer or more naps during the day?

It was a nightmare last night. We couldn't get our 3 month old to sleep until 12:30 and now she is waking up, not even 7 hours later! Usually she goes down between 9:30-10 and gets 10 hours (with one wake up). I'm worried this will make for an awful day. Is there something I should do? Encourage more naps?? Or just let her be on her normal "schedule"? I use that term loosely as she pretty much runs the show