I know the anger you feel. It boils up inside of me when my husband's grandma starts to talk about how her childhood 'wasn't perfect either'. The simple fact that a person is comparing suffering is completely... I don't know an accurate word. It's just dumb, lacks respect, lacks empathy, lacks common decency. But it's what people do. The reason might be along those lines:
Everybody suffers on their own personal level, and deep inside, most feel like they have it really bad, even if they deny it to fit in socially or cheer themselves up ("I'm so thankful that I don't have it worse"); it's normal. It's how humans experience life since they're all confined to their own experience and don't have anything else readily available to compare it to. It takes effort, information and imagination to even try get into other people's shoes, and only a minority are even aware of that. Most people are self-centered - especially sheltered people - and simply lack the capactiy to understand how much more awful than theirs life can be. They suffer and - naively - take the reasons for their suffering as the worst possible; thus everybody else's reasons can't be worse, only 'as bad'.
If your acquaintance has a problem even respecting other people's experience enough to let them finish a sentence, I can see how it would be too much to ask of her to take off her shoes and put her own life's struggles into perspective.
If she had your symptoms, if her suffering would be as incapaciating as yours, if her problems would keep her from enjoying her life and participating as much as yours do, then the work she'd have to do to get better (her therapy) would be comparable to yours. Her life isn't as effected, so her therapy isn't comparable to yours.
The methods her therapist uses, though, could also be helpful with PTSD. It's not like we only get chemo and she only gets camomille tea.
For some people with PTSD it's helpful to try and let go of their anger. I, personally, take my anger as my way to stand up for myself. My anger is the part of me that knows that I was treated horribly, that I deserved better, that I deserve to defend myself, seek help, demand respect etc.
I don't know what would work for you. You'll have to try, I guess.