Banyana Banyana walloped two-time champions Equatorial Guinea 7-1 at the Cape Coast Stadium to secure their second win in the competition and inch closer to a semi-final berth.
And the former international is not carried away by their progress so far as she insists her side will take it one game at a time in the quest to realise their goal at the tournament.
"Our goal is to qualify for the World Cup. We've never done it before. We've been back-to-back at the Olympics," Ellis told media.
"We've got to be critical about our performance. There is always some improvement. I felt after the first half that we didn't play true to ourselves.
"It was important we stick to the game plan and execute it well. Before we could know, we could have maybe been down but we managed to get that right," she continued.
"We are only looking at the next game and take it up from there. We take it game by game because we don't want to lose focus on anything. The next game is against Zambia and we will prepare well for the game."
South Africa face Zambia on Saturday in their last group game at the Accra Sports Stadium, Accra