I am doing a lot of this type of work. I have 2 more months---give or take a week to meet my 4,000 hours of post Masters experience and to get my LPCC. I will also becoming a registered play therapist.
I do a lot of attachment work and would be happy to answer any questions or offer any direction if you need it.
Here are two places you should check out if you want more info:
Association of Play Therapy-
Association for Play Therapy -- Home
Theraplay
www.theraplay.org
These two sites are my fav!
Your professors is correct. Working with young children---I usually see 2 - 8 year old. I get lots and lots of referrals because not many professionals in my area (I suspect other areas too) want to work little ones that young.
Best wishes!
Amy