I think her legacy in terms of statues or memorials has been quite poor and let’s say I think the current main players in the RF have done quite a bit to either erase her from memory, or besmirch her reputation.
So it would be refreshing to see a documentary made about her from the perspective of someone who wasn’t trying to do either of those things.
I disagree with this - perhaps not surprising! - but I thought it worth listing the memorials to Diana in various forms since her death that the Royal Family has sanctioned.
The very visible ones, all in Hyde Park/Kensington Palace Gardens which are Royal Parks and who therefore needed Palace consent for their on plans:
Diana Memorial Fountain (the first memorial and opened by QEII with Charles, William and Harry also there)
Diana Memorial Playground
Diana Memorial Walk
Diana Memorial Garden
Diana Memorial Statue
In Kensington Palace, Diana’s former home, a special wallpaper was commissioned to be used in the public areas, featuring pictures from Diana’s life. The annual exhibitions there have almost always featured Diana in some way or another: “Diana: her fashion story” was featured for many years, they have also had “Diana: glimpses of a modern princess”, and they have exhibited her wedding dress before and they generally items from her clothing collection on display.
Then there’s the more subtle: Kate has been lent several pieces of jewellery that were very associated with her late mother in law, most obviously the Cambridge Lover’s Knot tiara and Queen Mary’s emerald choker. Harry and William spoke to the BBC for their documentary to mark Diana’s death.
I’m not sure what else you are looking for in terms of royal family-supported memorials? Because I think the above demonstrates that the current “main layers” in the Royal family were very sensitive to the importance of respecting her memory and the public’s interest in her.