Even if they honor the contract she will get nothing besides being credited. Her contract states that she gets a percentage of the profits - and the movie will probably never make a profit. Return of the Jedi never made a profit "despite having earned $475 million at the box-office against a budget of $32.5 million" (Wikipedia "Hollywood Accounting") Very sad.
If it is well known that the studios use various accounting methods to hide profits, why do the people in the industry still accept contracts based on profits?
Since any contract can be full of tricks, it just means you need an army of lawyers even for the simplest things. It then gets really hard to actually do anything. And if you're poor, you're bound to get exploited by some obscure loophole.