No one can even give you an approximation by height. Sorry !You are a true "Prince Charming"! Possibly try a gift certificate. If just really want her to have a certian pair, you would like for her to wear, and try offering to help her exchange them for the right size or style, because I know as a woman, it is the thought that counts when giving a gift. Just know that some ladies have health issues, and the pair you pick might not be exactly something she can wear, so if she has to exchange them for a different style, do NOT have hurt feelings! You are so thoughtful, Good Job! ScottyBoysDoll