Hi @Dark_Olena,
I'm sorry to read how you are feeling - depression and hopeless are feelings I have experienced throughout some parts of my life so I understand somewhat how you are feeling.
Calling out someone can be a hard thing to do and if you are a person like me that would rather avoid confrontation / put it on the back burner because it isn't an easy thing for some people to do. Having said that, as a parent I know that instinct to protect your children and speak up even if it doesn't feel natural. The fact that a support worker was using their phone while driving your daughter and another had a car accident with your daughter in the car I think completely justifies your feelings and your reasons for speaking up. Support workers are in a position of trust and from the actions you have mentioned they are not doing their job in a capacity that they should. They have a duty of care to ensure your daughter's safety at all time.
I am glad that your daughter is okay physically but as you said her mental health has been impacted due to this incident and that can be just as significant (if not more) than physical injuries sometimes.
Would you find it beneficial to email your concerns to the organisation? That way you could put your thoughts down on `paper' and edit what you want to say as many times as you need to ensure you have said what you want to say in a way you want to say it? It would also (hopefully) ensure that you get a written response back from the organisation you are dealing with. I find if I am emotive when talking with people (whether it be sad, angry, frustrated, etc) I can get emotional and then I can't always think clearly and say what I want to say. Also when you engage with a person in conversation it can mean the conversation may go off track, get heated etc. Writing things out means you can stick to what you want to say and stay on track.
I really hope you are okay because you had the right to ask questions around people that are entrusted to care for your daughter. At the end of the day you are just trying to ensure your daughter's safety. I also hope you daughter is okay.
Warm regards,
FloatingFeather