If the girl is hijabi, there is nothing wrong with “loading on makeup and jewellery” and sitting on a stage with your husband on your nikkah.
But if she does not want to wear the hijab on her nikkah and wants to have a segreated wedding that thats great too. But she has to be aware of the non merham men (which includes her brother in laws, first cousins, and other men) should not enter the sisters side. And also the guests have to warned as well.