I had DD tested for auditory processing disorder. We thought that was her original problem.

First step is a hearing test. That'll rule out any hearing issues that could be caused by glue ear, or anything else. We saw a range of people starting with the school councilor, then OT & paed. The OT was the one who assessed her & there is no issues with her auditory processing. Tactile & vestibular are her main processing issues on top of ADD. But I recommend an assessment with an OT. IMO they are the best person to start with after getting a report from the school

Can't give you advice on helping her, but the OT will be able too. I think DD is more 'selective deafness'