bluey,
feeding 2 hourly thru the day seems very close. You wake her up to feed her? I remember when Renee was about 4 weeks old, sometimes after a good feed, she sleeps on for 5 hours, i wake her but sometimes no method can wake her up. Maybe your girl is not hungry yet at 2 hour intervals? LC recommends waking babies under one month of age up at 3 hour intervals if they are not asking for milk. After man yue, the LC told me babies know to cry when they are hungry already so if they have been feeding well, just let them sleep on. I appreciate the 5-hour rest for my nips. Currently, i wake her up if she sleeps past 5 hours (when i'm lucky!)
Sometimes, I also latch on when she starts crying. many times, I change diaper for her first even though she's already crying cos I can't put her flat down for a change after a feed, she'll spit up.
But good way to check for cues, like the experts recommend is the rooting reflex... stroke the corner of her mouth, see if she turns to your finger. she may also turn her head from side to side, put her hands to her mouth or suckle when you offer a finger.