That is a good point; she did use conflux's power set and the tensors. Only two ways out of that, though they are both long shots.
Options: She can siphon other epics powers with direct contact or she can, to an extent, mimic any epics power set that she comes into contact with. This would make her useless in the field unless she was guaranteed to touch them, which with say steelheart would have been impossible as he wouldn’t have let her get close enough to touch him.
Besides if she did have either option above she wouldn’t ever use it because it basically would make her loose it completely and then everyone would be screwed anyway.
I don’t know I just cant shake the feeling there will be more to Tia than anyone suspects.