I think it'd depend on how much she has to do at once.
I think a reasonable dream sorcery ritual would be perfectly remembering a dream you had, and if she had something like that she could iterate over it to fill in different elements.
There's also the question of who the audience is supposed to be.
If it's earth mortals then it has to get translated to a pure audio-visual experience, but publishing to the FCF would be perfectly valid. In that case she could basically pioneer the FCF version of cyberpunk brain dances, or at least a new type of them if that technology already exists.
She can become rich and famous in our hell, with a job in artistic R&D or something at our film studio to get USD instead of whatever our currency is ( I vaguely recall something with chips obsidian/night dragon scale or something like that?).
Her choice in the end, but the more I think about this the more I think it's a great idea @Yog . Everyone needs a creative activity to invest themselves in*, and Rosie loves horror movies. On earth her ability to even try becoming a major figure in that field is slim, but with this she could become a prominent figure in the history of her art on her skills/positioning alone.
Imagine artisanal nightmares, where someone could actually play with that word dream "this is normal" feeling to pipe context to your subconscious to establish background, letting people experience completely foreign cultures and languages like a native, impossible sensory input, or perfect emotional sympathy with psychological horror pieces.
It'd also make it way less awkward to give her support. I don't want to assume too much, but in my experience there's a level at which people who aren't outright leeches get uncomfortable accepting help even if they need it. If she's "just" translating her success from one medium to the other it isn't charity.
* Not necessarily as a financial thing either, though it's great if your passion also pays for your lifestyle.
