Until you get naps sorted out, at three-hr mark, I would feed, then do something with her to wake her...maybe a diaper check? Then put her down to sleep if she's tired. IMO, I think the most important thing about EASY is separating feed from nap, even if its just 5 minutes so DS doesn't associate feed w/ sleep...
FYI...My lo is 4 months, and she has never napped consistently. Sometimes I get 30 minutes, other times 2 hours. So I've never been fortunate enough to have the textbook baby w/ textbook schedule. But, I'm okay w/ going w/ the flow just as long as I do a little something right after feeding if lo is tired.