Make her watch Poor Kids: children below the breadline on BBC?
I second this. It was an eye opener for DC aged 6 and 10 last year. We also spent a lot of time in lockdown talking about structural inequality, the 'poor tax' etc. It can all be explained if turned into analogies that they recognise.
We are scruffy but well off (highly-paid jobs, multiple houses, and inheritances) though not super-yacht rich, but live in a rich part of a rich city, in a rich country. This means that their understanding of what was 'normal' was not even accurate for this country, let alone the wider world. I literally drew charts for them showing them where our wealth put us relative to others in the UK and the world.
They then briefly thought we were super-rich (i.e. Bill Gates type rich), so we talked about how what they saw around them influenced their expectations, and that there would always be some people better off, but that these people were really the extreme, and no we can't just buy a superyacht/fly first class everywhere. We also explained investments and talked through how we were planning for their futures and why we might prioritise some things over other, showy, things. We asked them to work through the same decisions to see what they would prioritise, and they tended to agree with us.
They then went through an 'I'm all right Jack' stage, which is where that documentary came in handy, plus talking a lot about how some families were struggling in lockdown. They see me volunteer with disadvantaged but very bright children, and I used some examples from that too.
My eldest is now a bit of a social justice warrior, and the youngest is definitely more aware of his privilege and understands he needs to use that to help make things fairer, though we are having to be careful with the messaging. I can see him feeling resentful that he currently has privilege but could lose that as things level up, so naturally he wants to hang on to it.