If she's already taller than me without heels than It's a turn off for me (I'm 5'8") but if it makes her taller than me (with heels on), then it's a turn on. For some reason I find girls with heels that are taller me, to be really hot. Again, only when they have them on though
No it does not look ugly. I've been a tall girl all my life. And now that I'm older, I wear heels every so often. People are gonna look and comment on our legs and height regardless of what we wear. So I say to hell with insecurity, and just do what makes you comfortable. If anything, guys love long legs on a girl.
I don't think it looks ugly no, it doesn't look ugly when short-legged girls wear flat shoes so the opposite also cannot be true. Maybe look at the type and shape of heel you wear as it does look odd and camel-like if you're fortunate enough to have luscious long legs and also wear heels