I'm not sure i see the tallness and associated comments as a huge problem - my dd1 is also very tall, and we have had similar comments since she was a (huge) baby. She is now 4 and the size of a 6 year old, and the biggest problem, as people have said, is that people assume she is older and expect her to behave appropriately (and dd1 has ASD, so behaving appropriately, even for a 4 year old, is out of the question!)
However, i do also agree with the bit where someone said that being petite, elfin, dainty, etc were desired attributes for a girl. dd2 is all of these, and the thing I have found most annoying is that since she was born, people comment on the differences between dd1 and dd2, in front of them, and say things like "at least dd2 is girly" or "oh, she'll never be mistaken for a boy, she's so tiny and delicate".
And that does make me as both dds understand, to a certain extent what peole are saying, and I hate it when dd1 is implicitly criticised for being tall.