Will an existing individual user joining a family plan loose their history?

[#1]

My daughter has an individual plan and is afraid she will loose her playlists, wrapped data etc if she joins our family plan and cancels her individual account. Is this the case?

[ChooseAGoodUsername]

With family sharing, everyone keeps their own account. They just need to receive an invitation from you to join the plan. Only the payment is shared; everything else remains separate.