Well one theory behind a freeze time ability is that the person doesn't stop time they just slow it way down. This has been used in other media before. When she uses her ability she goes so fast that to Hiro it appears that she is moving in normal time. When she isn't using her ability she is moving at normal speed and subject to Hiro's ability. Not all the characters use their ability all the time, so she probably just wasn't using it then.

I am saddened by what happened to Adam Monroe. He was one of the more likable characters even if he was a villain.

It really bugs me that this show can do whatever they want without regard to continuity. And nobody cares because the masses are all like omg heroes. The show started off so well with a good concept and then settled into this predictable pattern of some new godlike villain and some doomsday scenario that the heroes must stop. And this isn't going to end any time soon because it's actually what John Q. Public wants to see.