I think what we need to consider here is that it's not so much the summoners being tempered which is relevant here - although I don't doubt they would be (and again, the intention behind both of these primals was not to summon them as gods, but as instruments to achieve specific goals, so similar to Bahamut's summoning that very likely results in a different kind of tempering.) The question is how the sundered life forms stack up to her. Her summoners are gone; either sundered, or part of her. It is the sundered life forms she enlists which we're talking about. Though she may not be a primal on the order of power of Zodiark, she is nonetheless more powerful than almost any other Primal we know of. There is also the fact that they co-existed (whether peacefully, or not) for a time, and I am guessing they may well have shared an auracite before the Sundering. With the caveat that these are paintings by the sundered life forms, driven by memory of the ancient world, the
cave paintings from Rak'tika do suggest she emerged all the stronger from the conflict. Once he was weakened and removed, that power would, presumably, remain for her to draw on. It's not too important, though, because even at a base level, she is more than potent enough to temper a sundered life form.