If Shen Yanxiao had control over all the cities in the Forsaken Land and was given another five years or so of development time, then she might have the ability to fight against the four-nation alliance.
However, that was absolutely impossible right now!
There were more than a million people in the four-nation alliance army. Even though there were many citizens in the Forsaken Land, it was unrealistic for them to devote their lives to Shen Yanxiao in less than a year.