I wish she had been a little more practical in the negotiating. Perhaps point out precisely the number of inhabitants that lives thanks to the colony, specifying the number of elderly, children, women and men that lives in both cities and to pout out the FACT that without the ants they will all die to the next wave - which by chance is already coming - and that he KNOWS all this. Explain that he will kill everyone by doing this and that these people will be fighting for their families and not just for the ants.