From the BBC Strictly site:
Heather has a slow start to the week as she and partner Brian go through the moves of the Cha Cha Cha. She struggles to pick up some of the steps and tells Brian that she's 'lost' on a number of occasions, but the singer is more upbeat and confident about her performance than in recent times.
The good performance she put in last weekend and the fact the couple weren't in the bottom two has clearly lifted Heather, and she notes that she broke through a mental barrier on Saturday night, "I think I owed it to Brian and myself to do better, I tried my absolute hardest. I lost myself in the dance."