^Any pics...?
I had a sew in once a looooong time ago. People couldn't stop staring at me when I took the weave out and went to work the next day because my hair was THIN, broken off, and neck length--the shortest it had ever been. It never looked like that in my entire life. I wish I had pics to show how bad it was.
Anyway, I think she had sewn it in too tight, plus I didn't know how to take care of my hair while wearing a sew in so it wasn't receiving moisture on top of all of the stress of the weave.