7 is definitely on the low end so it's worth watching. There is a big variation in normal, of course, but some bubs do get into trouble like Taureans. They seem fine, may even be gaining weight, but once the initial oversupply settles down the low number of feeds may not be enough to establish a good supply. And some babies just cruise - take just enough but don't really demand well enough.
BUT. Watch her. You will know if it's not enough. If you see a big slowdown in poos (after 6-7 weeks it's normal for them to poo much less frequently) or any other sign of dehydration etc, then wake her and feed her more often. 12+ feeds is normal at this age. Those little top-ups do count as feeds, so it may be that she's a very efficient feeder & good sleeper Most of the time, it all works if we feed babies when they want to feed.