A passionate and impulsive woman.

[Trust No One]

The showrunners wanted 'Leslie' to pursue a reluctant and bemused Sheldon in an uncomfortable over-sexed manner. She told them to get bent, and walked, because she wanted more from her character than stereotyped glasses-wearing science girl desperate for a man who doesn't want her.

Yeah, that went well...

I never heard this. I did hear Jim wanted Leslie and Sheldon to be together.