She finds that she can only build them so high before they collapse. She then remembers a cartoon she watched about how archways don't fall because of the keystone at the top of the arch, and so she rebuilds her towers that way. Erika has solved her problem by .

Erika has solved her problem by finding and building a support system

Explanation:

The passage tells of the struggle of a woman or lady, called Erika, who attempts to raise an edifice, but faces challenges in structural defects. the buildings do not have the support required to get to the zenith or the uttermost top, so she's stuck with a low structure time again.

Her saving grace is knowledge, from an unlikely source but still valuable knowledge in how to get to the position she wishes to attain.

It causes her to realize that in order to get to the topmost height, you would need support from keystones- people and instruments of like-minds and similitude, with the structural integrity to uphold you always, and keep you on top.