I feel her pain, when I was growing up I was made fun for my stutter (“t-t-today junior”) made me felt very alone and different, never told my parents because I felt embarrassed and ashamed of myself that I couldn’t do something as simple as speak. I am now 21 just got out of a presentation in college, I spent 2 hours practicing my part. When it came down to it, I couldn’t speak a word, I’m a grown ass man and it was hard to fight tears because I tried so hard and I just can’t do it no matter how hard I try. When my parents ask me how it went I usually lie or as you mentioned I wouldn’t tell them the whole story. I have no advice, I’m sorry I’m still going through it myself but I thought some insight into what she might be feeling could help. Good luck!