Identify the incorrect part of the sentence: Her mother asked her what would she do after she graduated from college.

The point at which the sentence becomes incorrect lies in the use of "would" as it appears in the structure of indirect questions. In English, when forming an indirect question, the subject and verb often do not follow the typical question format. Instead of using the auxiliary verb ("would") before the subject ("she"), it should be structured in a statement format.

Therefore, the correct phrasing would be "what she would do after she graduated from college." This maintains the grammatical flow expected in an indirect question. Rephrasing in this manner clarifies the intended meaning without altering the overall structure of the sentence.

This understanding helps in identifying similar grammatical constructs where the inversion of subject and auxiliary verb isn't required, particularly in indirect questioning contexts.