Try step by step

 

Load V4, Put your slider to a frame ( example15 ) Load the sheet, Parent the sheet to her waist ( or whatever)

Pose her, go to the cloth room 

Now put the upper line ( like you see on my example) as contrained group,

Set up your simulation setting values

Don't forget, Colide against V4 and REMOVE center of mass , now calculate simulation.

There is no reason why it should not work...:(

La vie est éternelle. L'amour est immortel.

“Dwell on the beauty of life. Watch the stars, and see yourself running with them.”
― Marcus Aurelius,