Danson was hurt in a collision with an Argentine defender in the 53rd minute and left the pitch holding her shoulder and in obvious pain.
Cullen scored both of the goals in 2-0 win but in the process of netting her second she was caught by an onrushing player and hobbled off with a sprained ankle.
Argentina are ranked second in the world and beat Great Britain in the Champions Trophy final earlier this year.
Danny Kerry's side are considered serious prospects for gold at London 2012 and the South Americans are their likely biggest rivals, although he refused to read too much into the wins at the invitational tournament.
“Argentina were defensive," he said. "They invite the opposition to come to them with the hope of achieving a breakaway.
"The challenge is to try and unpick that and we were able to unpick them in the second half.
“We still don’t know how serious Alex’s injury is but Crista should be okay.
Kerry will now formulate his Olympic squad, which will be named on May 18th, and will then fine tune for the Games in a friendly tournament that features the Netherlands, Germany, Australia, South Africa and Ireland in Chiswick.
But the first name on his team-sheet will surely be Beth Storry, who was in imperious form at the London 2012 venue and didn't concede a single goal in four matches against high-quality opposition.
“We played really well," said Storry.
"We played out style of hockey and it was a positive way to finish the tournament. It’s great to keep a clean sheet in all four games; it’s great for us defensively.
“Winning in front of the home crowd feels really great. The crowds were really amazing, cheering all the time, which lifted our spirits. It’s a good sign for the Games.”