My husband and I actually are going through the same thing right now. I'm the cold one. 

Idk the full backdrop of your marriage or what "rocky" means to you, but for me I'm sick and tired. 

I'm 27, hes 28, we have been married for 8 years, have 3 kids, 2 dogs, jobs, and a house. 

We have so much responsibility, yet all he has to do is work, while I carry the rest. What we do, is what he wants to do. The things I do alone, are all under his thumb and only when its convient for him. 

He has become clingy and needy and it is very unattractive. 

Maybe instead of asking her why shes being cold to YOU and talking about how YOU'RE affected, ask if SHE is OK. How is SHE feeling? What is SHE going through?