There are plenty of girls over 5'7". My mother is 5'11" and one of my step sisters is 5'10". So to assume an woman over 5'7" as trans is total BS. I'm 6'5¼" and my height has never outed me as being transgender. Cis-women all the time complement me on my height wishing they were as tall as me. Unless someone is looking for it (like this guy that is a ->-bleeped-<-), the last thing on anyones mind is someone being transgender. I haven't been mis-gendered by anyone who didn't know me before since May 2014. So height alone is not going to prevent you from passing. Remember it's a combination of looks (face), lack of facial hair, mannerisms, hair, voice, dress, etc that determines whether you are passing/blending or not. I don't consider height a factor on passing, but it is a factor on getting noticed. The taller you are more notice you are going to get and if you blending in those areas, you'll be getting noticed as a cis-woman, not as a trans woman.