"She went to Denver."
Translation:Вона їздила у Денвер.
'Їздила' as were said upper, means a feminine person (she) moves from one place to another by something that is moving on the ground surface (e.g by train, car, bicycle) and then came back. 'Ходили' means the same. Except, instead of 'she' it's referring to 'they', and they were moving not by any transport, but by their legs, like 'walked to something'. Hope it makes it clear.