My son just turned 12 weeks and he eats 5 times a day, between 5-6 am, between 10-11am, between 2 and 3pm and between 6 and 7pm. He then sleeps from 8 or 8:30 till 5-something. His daytime schedule has been the same since he was about 8 weeks old, and he only recently dropped his midnight feeding. He gets 6oz a time. I would start trying to give her 6oz each feeding and then going at least 2.5 hours between feedings. Try feeding her 2.5 hours and see if she'll take it. If she does, feed her as much as you can and then hold off for another 2.5 -3 hours if she'll let you.
During the day my DS goes 2.5 to 3 hours at a time (hence the variation in the time of feedings.) Don't stress too much about it though. Let her lead you. She's not going to let you let her starve. :) I'm not worrying about putting DS on a "strict" feeding schedule till he's about 6 months old and we start introducing him to solids.