Having grown up a spoiled brat, given everything she EVER wanted and treated as a pet by her much older 1/2 siblings, to boot,and her father taking her to the set of MARRIED WITH CHILDREN, all the time, at a young age, who knows what she's done or not done in the past.
From her Wikipedia entry:
“in Beijing Wallis met Count Galeazzo Ciano, later Mussolini’s son-in-law and Foreign Minister, had an affair with him, and became pregnant, leading to a botched abortion that left her infertile.”