ABA isn’t for every kid and I disagree with the premise of control and dismissal of emotional issues.
OT can help Incase of sensory issues. However do not let anyone stress your child in the name of Theraphy.
Learn about stress, anxiety and neurological connections before you do anything. Also PTSD.
Seek cooperation not compliance.

One of my sons was speech delayed. We got him into speech therapy with the school district at three. He speaks very well now and continues in speech therapy working on the finer points of communication.

Your daughter’s story sounds like my son, interesting.

ABA is great, but speech is a specialized therapy. An ABA therapist won’t specifically work on anunciation or oral motor exercises.

My son had ABA, private speech (@ his school too), as well as OT. If I were to do it all over again, I would do the same thing, all 3 therapies. Again, this is my opinion, my results were successful. My son started to speak again at age 5, today he will be a Senior at a university. Has it been hard, yes, still is, but that’s life.

It isn’t about compliance, it’s redirecting maladaptive behavior via positive reinforcement.
If an ABA therapist performs therapy in your home, as the parent, you have the ability to partake in the session. Anytime you do not agree with the therapist delivery of services, you can intervene. I did, and he received the help he needed.

it can help with speech, OT works on the sensory behaviors, in USA OT would be included at that age, but I see you live in Australia