The Brit told BBC Sport: "Last year, I lost here 6-2 6-0 in the first round. It's a massive improvement. There's still so many things that can be worked on, but I toughed out the two wins and today I thought Sloane played pretty well. So, yes, still a pretty good tournament.
"I felt something in my shoulder yesterday, but we still don't know what it is because I haven't had time to see the doctor yet but these things happen, and you just have to play through the pain sometimes. But I thought Sloane played really well."
Robson received treatment on her shoulder from the trainer several times during the match, but was unable to match Stephens.