。
The point is, she won't try to do her homework on her own.
Literal
The-point [topic-は] she [subject-が] alone homework [object-を] do-[volitional-よう-to-する]-not [thing-こと] is-[である].
しようとしない ('won't try to do') is the negative of しようとする ('try to do'), built from the volitional しよう + とする. This captures the nuance of active refusal or unwillingness — she doesn't even attempt the homework. である is the formal copula, fitting the analytical 要は ('the point is') framing.