What is the passive form she goes to school?
I like Jacinta’s response. I don’t think the verb “go” as used in this sense has a passive form. If it’s a slightly different sentence, with a slightly different meaning, “she goes to that school” you could say “that school is gone to by her.” That sounds pretty weird and awkward, but I do think it is grammatical English. If anyone wants to argue the point, I frankly wouldn’t fight back too hard! But you might argue that “she goes to that school” is intransitive and can’t be made passive. I’d argue back that “goes to” is a phrasal verb meaning “attended,” and that the passive form is similar to “that school is attended by her.” You probably didn’t realize that your simple question, a very good one, involves some fairly complex linguistic features of English!