How does Hazel express her grief in losing Augustus in Chapter 21?

When Hazel is alone, she thinks about how the pain she is feeling is a ten on a scale of one to ten. She calls Gus's cell phone and listens to his voice on the voice mail. She gets on his wall page online and sees all of the condolences rolling in. she finds it ironic that most of the posts are from people she's never heard of.