Are All OK?
She lives diagonally across the street from us.
She lives diagonally across from the street.
She lives diagonally opposite the street.

Question

Answer

The street is the divider, so you must use "across the street", meaning "on the other side of the street". You can't use "from the street" or "opposite the street". So only the first one is correct.

She lives diagonally across the street from us.

There's another useful word to know. It is "kitty-corner" (also sometimes "catty-corner"). It means "diagonally across something". So, you can say:

She lives kitty-corner from us. :)

Answer

Not sure why you are working on this kind of questions. Hope you do not take offense, but it's not a good way to learn English

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!