It will certainly be interesting to see whether she nails or fails it.
The ATs I've enjoyed in the past have all been performed by contestants who were consistently good before their AT - Debbie McGee, AJ Odudu, Rachel Stevens, Rhys Stephenson, Rose and of course Fleur.
There have been some disappointing ATs and to me, maybe it was done too early before the contestants had a chance to improve or that the contestant was generally not very good: - Adam Peaty, Kate Silverton and Lauren Steadman's AT come to mind.
Kym is competent, but it's been mentioned before that her dances seem to lack energy and oomph, but I hope I'm wrong when she does the AT.