"That was a good run at this time of the season for me,'' the Beijing silver medallist said. "I'm not normally this sharp at this time of the year, so I had to trick my body into thinking it was track-season time.
"After the Capital Classic, I've got qualifying for the world champs in August in Sydney on March 9, so this was a good hit-out.
"It was a perfect venue [at Cooks Gardens] and an ideal night for running. The crowd was great, too.''
Van Dalen was elated after clocking 4:36.07 on her home track. She took command of her race from the outset, gradually distancing her rivals and, by the bell, she had half the home straight between her and the rest of the field.
Van Dalen, who was hoping to go under four minutes 40 seconds, finished ahead of a fast-finishing Camille Buscomb from Hamilton (4:43.86) and Cantabrian Rosa Flanagan (4:44.55).
"I'm stoked with my time,'' Van Dalen said as she prepares for the New Zealand championships in a few weeks. "It didn't particularly bother me taking a big lead. I'm used to being out in front, so I felt quite comfortable and with no wind it was a perfect night to race.''