Sabotaged on her studio debut, a novice filmmaker must produce her blockbuster without funds and with local amateurs to prove herself, before she loses the rights to her script.

It sounds good. Few suggestions that come to my mind:
For E.g., Anurag Kashyap is an Indian filmmaker. Before becoming a prominent filmmaker he used to write scripts for the studios for free.
He is known for choosing locations that are budget friendly. Once (I think on his first project), he leased an abandoned filthy place/building as his film’s location. He leased it with the condition that he will get the place clean. And he and his amateur crew did clean it, painted it new and after the film was shot, he handed the building back and today it runs as a restaurant building. (He had to clear bags of pigeon shit from that abandoned building)
This made his project’s budget under control.

Conflicts can be created giving such challenges to your character.

The novice filmmaker must prove herself before she loses the right to her script: It can be for instance, she must make her own film before the project is handed over to someone else. LOSING THE RIGHT does not sound correct as they (screenwriters) are protected and studio always has the fear of being blacklisted if they inappropriately get the rights.

It can be (in your words) : Sabotaged on her studio debut, a novice filmmaker must produce her blockbuster before her ambitious project is handed over.