"She goes to school" has a more a habitual meaning, and for habitual "to go" use the verb "chodzić". Like "we go to school every day"
"Ona idzie do szkoły" means "she is going to school right now"
Check the explanation above :) Iść means to go in a continue way, so it'd be she is going to school.
Apparently this verb is always used to mean that the continuous action is happening now. So always 'She is walking', 'We are walking' etc
This has been the most confusing exercise . please make upyr minds whether you want idze or chodze , go or are going!
Generally, Present Simple "to go (on foot), to walk" translate to "chodzić", Present Continuous "to be going (on foot), to be walking" translate to "iść", unless it's just "walking" around without any specific direction/destination, which is again "chodzić".
And the school context somehow messes with this distinction because of some idiomatic English usage :/
And locative is easy to identify, as it is always preceded by a preposition (przy, na, po, o, w), and never occurs alone.