Invisible Woman, Flame On! says:
Cosmic: Whenever Invisible Woman attacks or defends, target player loses 1 endurance for each face-up resource you control.

Exploiting the Flaw says:
Target exhausted, non-attacking Inhumans character you control becomes an attacker and cannot cause breakthrough this attack. Remove all other attackers from this attack.

So if you attack with another character and bring Invisible Woman into the attack, does her ability trigger? I'm rather sure the answer is no, that it only triggers when she exhausts to attack, but I just want to be sure.

Thanks,
Steve

For cards like Exploiting the Flaw which are really unusual, you'll often find helpful clarifications in the appropriate FAQ:She has become an attacker, which also means she has attacked, triggering her power. And from the Attacks glossary entry in the CRD:

Yeah, looks like I was wrong. Did some looking around and found the below posted on another thread. I guess it's just confusing to me because I'm originally a Magic player and there are very similar cards to this in that game, but this trick wouldn't work there because the act of attacking and the act of becoming an attacker at some later point in combat are different.

For a bit of context, there had already been a parallel rule for "defends" and "becomes a defender," since there were defender-swapping tricks appearing as early as the Crime Lords in MMK. The wording of defense-triggered powers even changed between "Whenever X defenders" and "Whenever X becomes a defender" at one point.

Exploiting the Flaw was the first of its kind, though, so the issue hadn't really come up for attacks until MHG.