I think in recent times Tracey has tried to be more sympathetic, but I can see her viewpoint. I don't think she wants to be seen as the bad guy this time but you can see it in her face in the hospital (and to a lesser extent Nicks) when Leanne and Steve were railing against both Dr Howarth and the mediator. As was mentioned Dr Howarth was basically brought in because Leanne refused to accept the findings of the previous Doctor, Ward I think the name was.
The reason that Dr Howarth phoned Dr Schmidt was probaby that they could converse with each other with all the required medical terms. Not to make Leanne and Steve sound stupid, but there will be medical jargon used that they don't understand, we've all had cases of that, not just with medical terms, where some technical jargon is used and your response is basically "And that means what?".