Stealth was trained by her father

Karen Quilt straightened her back and looked at the sidewalk ahead of them. “From a very young age, my father trained me to be capable and independent. Circumstances required that he was absent from my life for many years, but I continued training on my own.”
“What’s that supposed to mean?”
She turned to him. “I saw the look on your face back at the hotel, George. You know who my father is.”
His lips twisted before he could stop them. He pushed them flat again. “Yeah.”
“With that in mind, what do you think he would consider ‘capable’?”
“Jesus,” he said, “you really are a superhero.”

Excerpt From Ex-Purgatory, pg 220-221
Peter Clines
https://books.apple.com/us/book/ex-purgatory/id676938479