I wrote that they have shown me activities that convince me that they are self-employed. But behold and lo, in today's CPA letter from the AICPA is an article about bias.  Excerpt:

says cognitive bias in accounting can occur when professionals unintentionally favor information that aligns with their preconceived beliefs or judgements, potentially compromising the integrity of financial statements.

It is possible that I have a bias toward the perception of that she is self-employed. Maybe she truly is a hobbyist. I'll have to dig deeper.