Michelle Dunaj also said an agent opened a saline bag, contaminating fluid she needs to survive.
TSA spokeswoman Ann Davis told KOMO-TV it's against policy to deny a private screening for passengers who request it.
The agency is looking into the incident.
It happened last week as the Detroit-area woman was traveling through Seattle to Hawaii.
Dunaj said she thought she had prepared, calling the airline ahead of time and requesting a wheelchair and asking how to send her medicines through security.
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