I see your point, but also, as a trans person, I feel very strongly that asking people to use your correct pronouns does not have to be earned. This applies to cis people as well as trans and nonbinary ones.

She should be thinking about whether her business is as safe as possible for trans and nonbinary people, but that's because every boss should be doing that. Being so frequently misgendered should hopefully give her a little more understanding and motivation.

Having said that, there are a lot of companies and organizations whose trans/NB inclusivity goes no further than pronouns in email signatures, and it's disgusting. But I think it's useful to distinguish between her personal need to be gendered correctly (which doesn't have to be earned) and claiming to be an ally or to have an inclusive workplace (which does).