What did linda realize about the rubber pipe?

Linda knew Willy used the rubber pipe to commit suicide and she did not help Willy to solve his problems. Linda only took away the pipe and covered up Willy's problems. It is not only the protection from Linda led Willy to commit suicide, but also the inaction from Linda is other factor that Linda had responsible for the death of Willy. When Linda knew Willy tried to committed suicide and she did not help Willy to solve his problem.

"I am-I am ashamed to. How can I mention it to him[Willy]?

Everyday I go down and take away that little rubber pipe. But, when he comes home, I put it back where it was. How can I insult him[Willy] that way? I do not know what to do."