god bless you, this is totally normal - she's only 2 weeks old. Hang in there, it gets better. Could be the burp caught in her tummy, could be farts, could be she's falling asleep before she's finished eating, could be she's just not got the hang of this sleeping thing yet. Are you swaddling? Those times sound like it could be sleep twitches jerking her awake, swaddling helps with that.
Letting her go 3 hours between feeds should be no problem, you wouldn't want to let it go much longer in the day b/c those frequent day feeds will promote longer night sleeps.
Hugs, we all know how hard it is to get through those first weeks - just try to sleep whenever you can, day or night. It does get better!