It doesn’t really matter why she’s decided that her family can’t help (though that’s often a lie the adversary whispers in our ears), but if she’s closed off to that avenue of help and open to speaking with a priest, then let her! Hopefully, your uncle can see the wisdom in that when it’s presented to him directly. The point is to get her help; your uncle putting aside his desire to keep it in the family would be an act of strength in meekness, and I’m sure the Lord would bless that act.