BG wiki says you need to be past The Warrior's Path. Old wiki says Dawn.

I just tested on my mule that I've been working toward reforged relic armor. When I had the mule talk to Monisette the option for relic was not in the list. I then talked to Sagheera regarding relic restoration, afterward spoke with Monisette again and she then offered relic as a reforged option. My mule is on A Fate Decided. Hope that helps.