On July 10 this year, Gold Coast Detective Marcus Edwards rang Heidi Strbak and requested to set up a meeting.

Six years after the suspicious death of her young son Tyrell Cobb, Ms Strbak was again being questioned as to how the boy, 4, came to suffer severe injuries and later die in hospital.

Tyrell Cobb died in 2009.

Ms Strbak contacted her stepmother Diane and the pair headed to a nearby park where they met Detective Edwards.

"Detective Edwards questioned both Heidi and I at length...about Tyrell's death, and specifically asked her to comment on what he saw as inconsistencies between her evidence and the evidence of other witnesses," Diane Strbak said in Supreme Court bail documents lodged on Friday.