Hello PFN,
I don't know you but can I please add my tuppenceworth? I would just like to say that I am probably one of those mums that would comment on your daughter's height. Not because I think she is a freak but because of pure, unadulterated envy!! I realise you've had a hard time in the past because of your height but I wonder if this has clouded your perspective a little. Others may disagree but I think that in our society tallness is a very desirable attribute!!
I have the opposite issue (i.e. I'm very short) and it looks like my girls are going to be the same. I do have worries about them being picked on, especially in the physical sense, but I already have a strategy for dealing with it. I experienced some bullying as a child that was related to my height but, in hindsight, it didn't really bother me and others experienced it much worse than I did. I think the reason for this was that I didn't view it as a terribly negative characteristic and so any comments bounced off me. Don't get me wrong, I would still love to be tall but i don't think being short is that bad. Children will only focus on the things that get a reaction and with me that would have been my big nose!!!...still a sensitive issue so don't go there
I suppose what I'm trying to say is that you need to instil the belief in your daughter that being tall is not something to be ashamed of. This will then make her resilient to any comments. Also, try to focus on all of her positive attributes, so that she builds her self-esteem and doesn't form a view of herself that is based solely on her physique. You sound like a very caring mother so you probably already do but the reason I mention it is because I became known for being good at other things (e.g. running, being quite funny) instead of just being 'little KatyH'.
Perhaps you could identify the times when her height becomes an issue and develop some coping mechanisms for these moments (as mentioned in some of the other posts above). While you may not be able to change your own feelings about it, she doesn't have to know how you feel.
If my girls get picked on for being small, I hope that I and some other friends and family members will be an example to them that it's really not important and they can still do whatever they want in life!
((hugs from ShortyH)) xx