As long as you do your 30 minutes of therapy each day, and listen to the instructions / advice of Dr. Richards, and keep going forward with the therapy no matter what life circumstances, you are doing the therapy correctly.
It can be extra difficult to stay on track when all of the life events you're talking about come up though, especially when a loved one has cancer. But you can choose to view the situation as: all of these family members and friends visiting you means they care about you, and what's best for you. They want to help you and make sure you are coping with the situation ok.
It's a difficult situation that I think you have to weigh and measure yourself, but keeping on going with the therapy, and accepting these new social situations as extra "practice" & exposure you can get to social situations in the meantime, is the correct way to view it.