What you posted worked just fine for me 
I’ve messed with it and put an extra } intentionally and it gave me your error but from what I see all your {} are matched
Small thing
Also, if you want your character to do primp_neutral while changing do this:
&ADALINE starts primp_neutral
@ADALINE changes into School 3
@pause for 1.5
What you gave me that worked
INT. WALKINCLOSET - DAY
@ADALINE enters from left to screen center
ADALINE (talk_excited_happy)
Time to pick out my outfit for the day
choice
“Sexy” {
@ADALINE changes into School 1
@ADALINE starts primp_neutral
ADALINE (talk_pointup_happy)
Here I come world watch out.
}
“Cute” {
@ADALINE changes into School 2
@ADALINE starts primp_neutral
ADALINE (talk_pointup_happy)
Here I come world watch out.
}
“Punk” {
&ADALINE starts primp_neutral
@ADALINE changes into School 3
@pause for 1.5
ADALINE (talk_pointup_happy)
Here I come world watch out.
}
ADALINE (talk_apathetic)
Now, that I'm fabulous. I'm out.
@ADALINE exits left