[3] Charteris was admitted as an advocate in 2000 and came to the Bar on completion of her post as Legal Assistant to the Lord President of the Court of Session.

[13] In 2023, as Solicitor General for Scotland, she was instructed by First Minister Humza Yousaf to "fully investigate" claims that the Scottish Government had not handed over WhatsApp communications and text messages which were exchanged between senior government officials during the height of the Covid-19 pandemic in Scotland, following claims made during the United Kingdom Covid-19 inquiry.

[14] In May 2023, the Scottish Government received criticism after it was reported that both Charteris and the Lord Advocate, Dorothy Bain, had gone on holidays abroad at the expense of the taxpayer.

Charteris was found to have gone to both Mauritius and Italy, whilst Bain flew to Belgium, the Netherlands and Austria, at a cost of £1,430 to the taxpayer.

Charteris' trips cost the taxpayer £7,228, with the Scottish Government insisting that this "represented good value for money", as it "boosted Scotland's international profile".