Sharon Osbourne has addressed her daughter's health on American TV show 'The Talk'.
She said they were lucky it happened on camera, as it meant the doctor could physically see what happened to Kelly.
She said: "She's on medication, she's fine."
Sharon added that doctors still do not know why Kelly had the seizure.
Chrystalla Spire told ITV News she, "couldn't be more pleased, " that Sharon Osbourne had spoken about her double mastectomy.
She said; "it's a tremendous fillip to this area which is still overcome by taboo."
Ms Spire founded and runs a group to support women who have been through similar experiences.
Speaking about her own decision to have a double mastectomy she said, "it was a very easy decision to make, I discussed it with my daughters. And we really didn't take very long to make the decision and it was one that I was always very pleased I had made.
Prior to the surgery for her double mastectomy Sharon Osbourne also learned her breast implants had leaked into her stomach wall, which has now put her off cosmetic surgery.
"Sometimes I'll see a photo and I'll think, 'My face looks plastic'; it can look so unnatural from certain angles. Now I am definitely, definitely done," Osbourne told Hello! Magazine.
"You can't buy your youth back, no matter how much money you've got. I won't be going under the knife again."
Daybreak's Health Editor Dr Hilary Jones has told Daybreak that Sharon Osbourne "had one of the faulty genes" which would have made her much more susceptible to cancer.
Sharon Osbourne has revealed that the decision to have a double mastectomy was a 'no brainer' after taking the agonising decision to opt for surgery. Daybreak's Ross King reports:
Piers Morgan, who has conducted emotional interviews with Sharon Osbourne, reacted with surprise at the news that the former X Factor judge had undergone a double mastectomy:
It has been a rollercoaster year for Sharon Osbourne, who has had highs such as becoming a grandmother for the first time to baby Pearl and the marriage of son Jack, but she has also had the upset of Jack's diagnosis with multiple sclerosis at the age of 26.
She underwent a 13-hour operation but refuses to feel sorry for herself.
"For me, it wasn't a big decision, it was a no-brainer," she said.
"I didn't want to live the rest of my life with that shadow hanging over me. I want to be around for a long time and be a grandmother to Pearl. I didn't even think of my breasts in a nostalgic way, I just wanted to be able to live my life without that fear all the time.
"It's not 'pity me', it's a decision I made that's got rid of this weight that I was carrying around."
In an interview with Hello! magazine, Osbourne, 60, said:
As soon as I found out I had the breast cancer gene, I thought: 'The odds are not in my favour'.
I've had cancer before and I didn't want to live under that cloud: I decided to just take everything off, and had a double mastectomy.
Sharon Osbourne has revealed she has undergone a double mastectomy after taking the agonising decision to opt for surgery as a precaution against further cancer.
The former X Factor judge, who has already battled colon cancer a decade ago, made her choice after finding she carries a gene which increased the risk of developing breast cancer.
Sharon Osbourne broke down in tears while discussing the her son Jack's diagnosis with multiple sclerosis.Read the full story ›