This article contains spoilers for Halo episode 3.
Halo episode 3 revealed Makee's backstory, and in doing so rewrote events that - in the main timeline - took place after the Human-Covenant War. The first two episodes of Paramount+'s Halo TV series attempted to hew relatively close to the original canon, with one particularly notable divergence; the introduction of "Blessed Ones," a minority of humans who possess the ability to activate Forerunner artifacts with a touch. Only two Blessed Ones have been revealed to date; the Master Chief and Makee, a human who was brought up to adhere to the beliefs of the Covenant.
Halo episode 3 revealed Makee's backstory. She was a child brought up on the planet Oban, identified as a "UEG Tier 2 Waste Salvage Colony." The glimpse of Oban is a chilling one, showing a harsh and brutal regime where even children can be beaten to death by overseers if they aren't working; the civilians there feel more like slaves than citizens. Makee was rescued from this life by the Covenant, who possess technology to detect Forerunner technology - and it apparently also detects the presence of a Blessed One. Little wonder Makee was a willing convert to the doctrines of the Covenant's Prophets; she had seen the darker side of the UNSC, and had no reason to love her own race.
The planet Oban will be familiar to many players of the Halo games. It first appeared in Halo 4, envisioned as a remote planet discovered after the Human-Covenant War and used as a home for millions of refugees. Although the first two episodes of Halo aligned fairly well with the main timeline's canon, this is a major divergence; it means an entire planet was discovered decades ago and used for a very different purpose. It's further worth noting that the Halo TV show's Oban presents humanity's galactic civilization as far more dystopian than anything in the main timeline.
Paramount+'s Halo series has received something of a backlash from some gamers, although in truth the changes they pointed to in the first episodes were typically things drawn from the wider lore than the games themselves instead of being entirely new. But Halo episode 3 marks the moment when showrunners Steven Kane and Kyle Killen have decided to take things in a very different direction. In the case of Oban, the TV series has essentially lifted the name of the planet and placed it upon a completely different world - transforming a refugee planet into a "Waste Salvage Colony."
Makee's story is entirely original, meaning it's difficult to see where her arc is going. The first two episodes seemed to hint she still had an affection for humanity, but in Halo episode 3 she participated in a brutal slaughter on one UNSC vessel, and didn't show even a hint of regret. It seems this particular human really is committed to the Covenant - making her a terrible threat as Halo continues.