照你的理解，原句應該改成

照你的理解，
原句應該改成：Her son is a lawyer, who is solving for himself the problem of a scholar in politics.
改得更好一點：Her son is a layer, who is solving for himself, in politics, the problem of a scholar.

原文裏scholar前的定冠詞告訴我們，這個in politics是修飾scholar的。