I'm not sure how custody works in Italy, but is there a way Cris can put his foot down and "force" the help she needs and changes to make? I mean no disrespect to you, Cris, Luci, or her mom, but isn't there some way he or someone who legally represents him can force the issue a bit as he is the father? This is his little (well, big) girl after all. I know he's busy though, and that brings my suggestion of someone to represent him. I certainly don't mean to paint him as a bad dad.
Like I said, I know not of the legal system in Italy, or how it works. Maybe all that can be done on you and Cris' part is being done. I do know that a parent would do pretty much anything for their kids. It's got to be tearing Cris up inside to see her going through this, and feel limited in what he can do due to his schedule. That said, something's gotta give. The question is, what will give?