I don't think they ask us to take a test here in France.
Yes, I have 2 kids, one baby aged 9mo (his baby) and D10 (SD for him).
I was told D10 won't be questioned but I can provide evidence she's seeing a therapist because she's scared and traumatized
I don't know anything about the French system - ours in the US is based on English law so there may be some similarities between the US and UK but I think France has some different legal traditions.
Here, it's not standard for parents to be tested, but you can file a motion with the court to do that. I filed a motion for the court to appoint a Custody Evaluator - a Ph.D. psychologist - and he asked us to take the MMPI-2. Maybe you can find out what options you have based on how things work there.
Also, in our system, kids usually aren't questioned in court, but if there is a Custody Evaluator he can talk with the kids and anyone else who might have important information, and use anything relevant to make a recommendation.
It may be possible to subpoena your daughter's therapist, to get her input, or for the CE to talk with the T.