Goals either side of half-time from Maya Le Tissier and Elisabeth Terland saw the Eagles defeated in Manchester.
Reflecting on her team's overall performance, Potter said: "It's difficult and it's a really fine balance, isn't it? Because we've got to realise the position that we're in and the teams that we're going to come up against.
"The players followed the game plan pretty well today. There's definitely moments that we need to work on. Like if we're excellent out of possession then we need to do better in possession.
"We need to have a little bit more of a full performance. But that will come. It's starting to come in larger parts.
"We've got to be better on a transition to keep the ball a little bit more. So there's things to work on. There's a lot to take out of possession today, but we've still got to improve in certain elements."
