She also managed to teleport away the psi energy from within the base when she left; that's why clairsentients weren't able to detect where she went and that's why psi worked so poorly within the area.
Oh, I don't think she 'teleported the psi energy' anywhere. I think she used so much power that she 'burned' the local noetic continuum.
She didn't take the Psi with her, she just so badly strained the fabric of spacetime with her desperate 11th hour stunt that the area became Psi-dead.
And what tends to show up when Psi is weak, or absent?
No wonder they keep the area cordoned off, it must be like a *magnet* to Aberrants!