I agree with the other posters I'd put her name down now just in case you decide you want to try 3yo Kinder.

It helped my DD1 a lot, when she first started she was shy & didn't like being around new people but by the end of term 1 she was making friends & coming out of her shell.
DD2 also goes to 3yo Kinder & loves it. It's her special time away from her sisters where she gets to hang out with her friends, sing songs & do dances etc...