Lindsay Lohan -- Hiding Crash Wounds For Liz Taylor Gig

Lindsay Lohan is so determined to prove she's no longer a slacker -- she's hiding extensive injuries she sustained during her massive car wreck yesterday ... just to keep shooting her new Liz Taylor movie.

Sources close to Lindsay tell us, the actress refused to let producers cancel yesterday's shoot because of the car accident -- bee-lining straight to the movie set once she was released from the hospital.

We're told Lindsay has several visible injuries on her body -- including bruises and scratches -- but she asked to cover them with makeup so she could keep shooting.

Sources tell us, Linds is so serious about nailing the Liz role -- she refuses to let the crash become a distraction.