From what I have heard it depends on how old the charts are that your area are using, the very old ones I believe were based on formula feeding, the more recent ones used by MCHN are based on a mix of formula and breast feeding (so better but still not the best for assessing BF babies). I always just used to go home and check out the figures on the WHO charts after each appointment.
DS only night weaned at 30 mnths (cause he was really only feeding once a day and that was at night ) and that was still hard.
DS still wakes once/twice a night most nights lol When DS was little I did a lot of reading and read a great site that explained night waking in another way.... When babies are born a lot of thier nural pathways are still developing and through touch it helps those pathways to connect so in fact you are doing your little girl a favour by responding to her night waking and helping her brain to develop.
As you said she is well proportioned and if she is active and healthy that is all that matters
You may want to take some action if it seems that your DD is unable to go to sleep by herself (i.e. she is waking every couple of hours). But if she is just getting hungry in the night then I wouldn't bother night weaning.
good luck!
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