Katie announced on Twitter, she would not be playing Tinkerbell in the show's final week.
She wrote: "Absolutely gutted but on doctor's advice I've had to take the final week out of panto as I'm unwell... I've loved my time as Tinkerbell in Peter Pan @ABPtheatreshows.
"I'm so sorry to everyone who has booked tickets... but you'll still have a fab time with the rest of Peter Panto x."
Katie's role in the panto was her first since leaving the ITV soap.
Katie played Sinead Osbourne, also known as Sinead Tinker, from 2013 until 2019.
Her character died last year as her cervical cancer had spread and unfortunately treatment was unable to help.
Sinead was diagnosed with cervical cancer in 2018 whilst pregnant with her son Bertie, but she refused treatment as she didn't want to harm her baby.
Although earlier in 2019 she was told her tumour shrunk and showed no signs of spreading, just months later she discovered a lump on her neck and it was later confirmed the cancer had spread.
After her death Daniel struggled to cope without his wife, but eventually Bethany Platt made him see he needed to be there for his son.
Do you miss Katie in Corrie as Sinead?
What do you think of this story? Let us know on our Facebook page @EntertaimentDailyFix.