Ask your gp about an Enhanced Primary Care Plan. It entitles you to 5 reduced cost OT etc sessions a year. There is also a Mental Health Care Plan which entitles you to 12 similar cost sessions a year (not 100% sure your DD would be entitled, but ask about it).

There is also the public system. Waiting lists can be long, but you have time to get on those lists. You also get Medicare rebates on top of the EPC etc.

Hope that helps in some way & good luck