QLD Steps to take when facing CPIU investigation for alleged step-child abuse (delayed reporting)

[KindnessKills]

Hi everyone,

I am seeking general guidance on navigating a police investigation. I am being investigated by the Child Protection Investigation Unit (CPIU) regarding an allegation of physical abuse made by my step-daughter. The alleged incident occurred over five months ago during a family conversation, but the complaint was only filed recently after she left home and we refused her re-entry.

Key facts:

• She was 17 at the time (now 18).
• My husband witnessed the entire interaction via phone call and is preparing a witness statement.
• We have extensive text message history showing a close relationship (she called me "Mom" and confided in me about personal issues), which contradicts the abuse narrative.
• There is evidence she was secretly leaving the house via a broken window seal prior to the incident.

I have drafted a defence summary, and my husband drafted witness statements, but I have questions about strategy:

1. Should we submit these documents proactively before any police interview, or wait?
2. How should we handle third-party issues discovered during this process (e.g., threats from the boyfriend's father, another parent offering illegal contraception)?
3. What are the risks of submitting a written statement early versus waiting for a formal interview?

Any advice on finding the right criminal defence specialist in QLD would also be appreciated.