"Again, another day of what dreams are made of," James said as she left the field. "I'm happy for the team and everyone's buzzing. And yeah, we're looking forward to going into the next round."
The 21-year-old had already teed up Alessia Russo and Lauren Hemp before scoring herself to make it 3-0 as half-time approached, and she thought she had made it four with a superb shot into the top corner.
However, after a VAR review, Lucy Bronze was found to be offside in the build-up, and the goal was chalked off.
"Yeah, I was disappointed in the moment obviously, but that's football for you, and in the moment I just had to refocus for the game to continue," James told a press conference.
Undeterred, she struck again in the 65th minute and set up Chloe Kelly for England's fifth in a rout that sees them sail through the group stage with three victories to top Group D and sets up a last-16 clash with Nigeria in Brisbane on Monday.
"I think I'm just playing with freedom, feeling myself and just enjoying my football. I think tonight showed that, and so did the last game, and hopefully I can just continue doing that and take it into the next round," James added.
True to form, England coach Sarina Wiegman gently steered the discussion away from James' individual brilliance and back to the collective performance.
"I think you could see it from the whole team, that we were enjoying ourselves, you could tell that we were really connected," Wiegman told reporters.
"The ball was going around and we had different ways to go and attack, and LJ was one of them, and when she scored you could also tell that the whole team was enjoying that."
Wiegman made a number of tactical and personnel changes for the final group game, but dismissed the idea that her tinkering would make them harder to work out for Nigeria or the other teams they may yet face in the tournament.
"That's a part of the game - every team has an analysis team, and they will watch the games and predict how we are going to play, and that's the same for us," she said.