Having secured progress to her first-ever Grand Slam last-four bout, Pennetta is delighted with her recent displays.
"From the first day of the tournament I never thought I would be here and be talking about the semi-finals," Pennetta told reporters, "I didn't play my best tennis in the last six months, and I just tried to keep working and working the same way every day.
"I'm starting to feel more my forehand, my backhand. Everything is starting to feel more normal in the way it was before the injury.
"I'm playing really good tennis here. Every day is much better. Every day was tougher and I've adjusted, tried to use everything I have and take it to the court and play my best tennis."
Pennetta will now face Victoria Azarenka for a place in the final.