from what the intro of the very first novel chapter indicates:
she'll eventually make a 120mm tank cannon she'll carry on her arm and blast elite royal guards into pieces with HE shells as she brings a entire country to it's fiery end.
@uppercase that immediately made me think of The Hero is Overpowered, but overly Cautious, who had like millions of mana points, but was worried to have lost a couple as for Astrid, seems like she has a friggin' huge pool of mana to draw from, so...