One of the few podcasts I listened to - if I understand right her second Zeta is fed partially by her own Lead Zeta - i.e. when that NS comes back with 50% life and dies it feeds her TM. That was in the podcast - but I can't tell you it will actually work that way of course.
Supposed to also feed off the NS zombie dying again and again. - Same for Old Daka's heal and res - same for Talia's own heal on basic - if you time it right.
And yeah, she can get up to 100% TM if someone AoE's and deals enough damage. It'll be a nice check on any toons that can ignore Protection as well.
Still, her unique zeta is much more situational then some - but way more useful then other's (Rey...)