But friend's of the star--who was placed under involuntary psychiatric hold last month--have expressed concern that she may be in danger of another episode.

"There still are issues. Mischa's just not herself at all. I think she has gone back to work too soon. She is on the verge of another breakdown and I think it could be even more serious than the last one. She cries for no reason."

The movie's producer Ashton Kutcher begs to differ saying Barton "was never unavailable for a day of work" and credits her for  helping guide younger cast members through filming. 

Role model Barton kept busy between takes smoking cigs, munching on snacks and playing with a dog in between takes.

For More Mischa:

Mischa Barton Getting Fightin' Fit

Mischa Barton All Strapped Up

VIDEO: Mischa Barton Back To Work