Digital nomad visa for freelancers?

Hey everyone, thank you for the feedback you already gave me. My partner decided to go a different route and apply for a digital nomad visa. She's a freelance voice actor in Germany and will continue to work remotely during her time in Brazil.

However, she does not have an employment contract, which I read may be an issue. Could anyone chime in on this? I specifically have questions about the following things that are unique to her line of work:

1. Declaration from the applicant who attests to the ability to perform his/her professional activities remotely, through information and communication technologies

We found a sample declaration from the Munich embassy. What else should this contain in the case of a freelancer? She can record everything from her computer.

1. Copy of the Employment contract or contract for provision of services or other documents proving the link with a foreign employer

As a freelancer, she doesn't really have contracts, as she works on an invoice basis. She can, however, offer a letter from her agent (not technically an employer, but someone who finds work for her) and from a client who she will record an audiobook for in February. Usually her work comes very last minute (1-2 days prior), but maybe there's something that the agent can attest to this? What would you advise here? Is this enough?

1. Proof of means of subsistence, from a foreign paying source, in a monthly amount equal to or greater than US$ 1,500.00 (one thousand five hundred U.S. dollars) or availability of bank funds in the amount of US$ 18,000.00 (eighteen thousand U.S. dollars).

This is not an issue. She has much more than this in savings and for a single job she makes more than 1,500 dollars. The problem is that she cannot prove that she will make money every month 6+ months in advance. Will the bank funds be enough?

Thank you so much.