We do not know what happened to the skull after the brain was removed.

Was it curated and displayed?

Was it kept somewhere and eventually returned to the cairn?

Was it used in other ways?

The skull fragments were found with the rest of the remains in the cairn, but this tells us about the final deposition, not about the intervening period.

We do not know what the bone tools were used for.

At least one appears to have been used as an implement, as the study notes, but the specific activities for which it was used are not identifiable from the available evidence.

We do not know why Individual 2 — the juvenile male, genetically related to her — was not subjected to the same post-mortem treatment.