I am so sorry for you and your daughter. She will get through this.
She has a child and it's a pity she can't have more, but if it's not possible she has her likely boy. I would get a second opinion though, perhaps she could delay that operation until her heart is sorted.
I was was diagnosed with a leaking mitral valve 10 years ago, for two years I went back and had it checked, told it hadn't got worse and I was that I was probably born with it and it might stay as it us. Meanwhile I convinced myself I would need it replacing and went into it thoroughly and found out that it was a safe procedure with excellent results and it stopped me being in panic mode.
I don't know what you mean by pathway, but she will be in good hands with a team looking after her.
There is nothing worse than seeing your child, whatever age ill and we would rather it be us yet she will get through this and has her husband, son and you there for her.
Sending youall my best wishes for you all.
Orchids and other lovely plants that don’t need a lot of attention
Hope everything goes well for her.