>>722948848
I think you've misread something. Lace isn't jealous, and she's not trying to stop Hornet, especially not in Deep Docks. We know from her other fights that she's capable of a lot more than what she showed in Deep Docks, and she shows up in multiple other places just to taunt Hornet but never attacks her.

Keep in mind that Lace also never attacked the bugs of the Citadel despite being more than capable of destroying it herself. She could've killed Ballador and totally prevented Hornet from reaching The Cradle. She could've destroyed the Psalm Cylinder in the Whispering Vaults or destroyed the Architect core in Cogwork Core too. But instead, she frees Hornet and leads her to The Citadel and eventually The Cradle.

Lace and Phantom didn't like their mother. At all. That's why Phantom wanted to die and Lace did nothing to stop the Rebellion, assist Widow, or thwart your attempt to seal GMS. Hell, she also attacks Silk to start of Act 3.