Anatole Leonard suffered from a massive guilt complex for the Rain of Death, and that's the reason for his determination to protect Earth from everything and him being a Jerkass
According to From the Stars, he was a member of the Anti-Unification League and involved in a plot that resulted in the destruction of the Southern Grand Cannon and, had Roy not killed the material executors, would have destroyed the other Grand Cannon too. Considering his massive ego and that before the Rain of Death he was a likeable person, there's a good chance he thinks that, had he not done that, the Rain of Death could have been stopped. Dana's clone source.
In the original Southern Cross, Dana and Zor Prime knew each other because the aliens were using brainwashed humans as soldiers. In Robotech, the Zentradi were all clones created by the Tirolians, one of which was Dana's mother. In the novels, Dana openly tries to spot anyone among the civilian population of the Robotech Masters who bears a family resemblance. Given Tirolian cloning tech can have the clone channel the original, perhaps the original Zor and the woman cloned for Zentradi stock knew each other.
Robotech is basically an alternate timeline of Command&Conquer
Mostly just because I can't help thinking Tiberium is a lot like the Flowers of Life/Protoculture.
Dana tried to hit Maia when they first met
"Prelude to the Shadow Chronicles" shows their relationship is flat-out horrible, with Dana looking at her sister in hatred and Maia showing fear before the former bows her head and leaves sad. Considering everything Dana had been through, including either losing or having to leave on Earth her younger brother, before suddenly discovering her parents had another daughter and didn't bother to tell her, it's very likely she snapped and left Maia traumatized upon first meeting her and still hates her, even if she understands Maia is innocent and is simply unlucky enough to be the perfect scapegoat.Dana dyes her hair
As a baby she's green haired, but every other appearance has her blonde. She likely started dying her hair to avoid anti-Zentraedi discrimination and continued for this reason while on Earth, and after having to leave she kept it up to distance herself from her parents.