At 7 your daughter is a little young for her wishes to be decisive on the issue as it is not util a child is 9 that hey start to have any real understanding of abstract concepts.
On that basis you shoudl not concentrate on her wishes - after all the dentist is not a popular person either!
HOWEVER you do have excellent reasons to be concerned about him seeing the child - his threats in Court let alone anywhere else and this is what you should concentrate on, together with the violence he subjected you and your daughter to.
It is fine to point out hat her memories of him are ones that cause fear and that you are worried about the possible long term consequences of her seeing him.
You are equally entitled to say that you truly believe he is using the child to get a vis a and that once he has that he will drop her again.
These are all genuine worries you have - and that you are entitled to have in the circumstances.
Remember the CAFCASS officer is simply there to find out what is best for your child - and that is what you want as well - so he or she is not the enemy!
If you are still suffering from anxiety as a result f your ex's actions then you may be eligible for Legal Aid (if you qualify financially) - so it oculd be worth looking at that prior to the next hearing.
I hope that this is of assistance - please ask if you need further details