Supaya vs Sehingga

Sehingga means "so that" as a result of an event that occured.
For example: Penny kehujanan sehingga dia sakit.
(Penny was caught in the rain which resulted in her being sick).

Supaya means "so that" in the sense of theres a purpose of doing something.
For example: Robert harus minum obat supaya cepat sembuh.