Some posters with way more knowledge of therapy matters than I have, question Tai's approach of "You have issues and so does everyone else," as being dismissive of Dora's "issues." (I hate that word when used that wayi but can't think of anything better at the moment.) I don't want to deny the validity of that viewpoint, but I read Tai's dialogue as trying to persuade Dora to not deny her achievements because she has problems in other areas -- an interpretation I wholeheartedly support, especially when I'm trying to give myself a pep talk.
I am reminded of the mini-storm a couple decades back when some disability advocates were quoted as decrying stories about physically disabled people doing extraordinary things (climbing mountains, sailing solo, etc.) ... the phrase used was "another supercrip story," opposition to which was based on the idea that such stories denied the difficulties in every day life faced by physically disabled people. I never understood that viewpoint; figuring the story of, say, a one-legged man sailing solo across the ocean might inspire another person in a wheelchair to deal with more mundane challenges. I also remember that mini-storm faded quickly without active media support; I think people as a whole would rather be inspired than discouraged.
tl;dr? Tai's heart is in the right place, even if her foot is occasionally in her mouth. And certainly Dora is the most conventionally successful of the main QC characters (I said "conventionally;" the Svens of the world, into whose laps success falls, are anomalies, no matter what the late-night get-rich commercials say.)