I mean, just stop using filters etc? Just stop it. She's an influencer with a cult following (ha), people would notice. Sometimes silence speaks louder than shouting.
See, here's the thing with the podcast, if she wasn't trying to come across as 'inclusive' then it's fine. There's nothing technically wrong with three white women creating a podcast to talk about their middle class opinions on things that don't really affect them. I personally don't like the podcast, I find it vapid. But some people would like it and that's fine.
However, when a large part of your brand involves talking about diversity and inclusivity, it's glaringly obvious when she misses that completely and that should have been picked up on. But witnessing her behaviour with people commenting on the Facebook page (even the one comment that said something along the lines of 'Lucy is great but let's check our parasocial relationships, she did duck up', Lucy completely went for her) I imagine she's very difficult to work for as she won't take any criticisms.