Sienna Thornton actually just wanted to deceive Simon Forrester this time.
The mental distress part can't really be counted against Simon Forrester. Even more so, even if her injury were taken to court, Simon Forrester might not necessarily need to be held responsible.
She didn't intend to deceive him at first, but he offered to take responsibility, so Sienna Thornton assumed he was legally naive. That's why she took the opportunity to push further, betting that he wouldn't abandon her injured leg, and she could make more demands.
Perhaps he understood that all she wanted was the design plans, but he played dumb. So she cooperated in the act, knowing that with time, he'd eventually get annoyed and might just throw a design plan her way to settle it.
"If you really can't figure things out..." Simon Forrester chuckled lightly, then picked up the notepad on the coffee table, scribbling down a string of numbers.
