What are my client’s prospects for a full healing of her heart problems? Is there anything I can do to ensure that happens?

As you told her, because you were sensing this intuitively, she is healing her heart. This is the exact paradigm causing her difficulty at such a very young age. It was the suffocation of her heart, being in a vacuum devoid of love that caused her difficulty to begin with. This was, in part, resonance with the mother, both genetically and emotionally, as well as the mother also being struggling with deep inner issues and conflicts, and was under-loved. As she continues with her journey, with more healing coming her way, the energies contributing to her heart condition will be resolved and the healing will hold. This is the great gift you are bringing to her, far beyond the emotional relief. If you keep going, this will be certain.