She was already very important in season 2 cause she were the one to save the world from the virus in exodus by absorbing it all in her out from the whole town of odessa to prevent it from spreading further.
She would had either died because it was too much OR be saved by mohinder afterwards.
However, since the virus plot got cut as also the season 2 due to the writers strike, her and monicas stories couldn't unfold and go further so we get to know both characters more and better.
So the most interesting parts of them wasn't there.
It is stated that she is the one that will "change the world" in this season.
However, I hope it's more than the fact that her strains used by mohinder are giving powers to normal people.
I also hope that she won't get wasted like other characters cause I like her a lot.