Gamemnae is the Leviathan lady's name, I believe (Gemma is her 'fake' name, which is easier to type, so I'm just going to use that instead going forward
).
It sounds like she either wants to create The Matrix, or San Junipero (
Black Mirror reference
).
Considering Brainy is a technopath who can now unlock his full potential, he might be the only one who can actually stop Gemma/Leviathan's tech from taking over the world.