Millie Bobby Brown cancels appearance due to health

March 28 (UPI) -- Millie Bobby Brown canceled an appearance over the weekend due to health concerns.

The 13-year-old British actress was scheduled to attend Collective Con in Jacksonville, Fla., on Saturday, but dropped out because of exhaustion.

"Hey, guys. I've never had to do one of these videos before, but I have had to cancel a comic con last minute, which is something I've never, never done and I'm planning on never doing again," Brown said in an Instagram video.

"I just think I've worked too hard and I have to rest, as I've had a really long shoot and I'm still filming Stranger Things," she explained. "I'm sorry to everyone who was going, and I promise you guys I'm going to get back to you. I love you guys all. Thank you so much for your continued support."

Brown plays Eleven on Stranger Things, which will premiere a second season Oct. 31 on Netflix. David Harbour, who portrays Jim Hopper, told Vanity Fair in January that the new season will be "thrilling."

"I got the first script of Season 2, and the first five minutes I was on my feet going 'Yes! Yes!' Because they open up the world in such a new way," the actor said.

"These characters that I feel like are so iconic, and that we love so deeply, get to really go on different arcs and different journeys and explore these little things that we touched on in their personalities and psychologies. And we get to really expand on that," he shared.

Brown will also star in Godzilla: King of Monsters, a sequel to the 2014 movie Godzilla, with Vera Farmiga and Kyle Chandler. The film will open in theaters in March 2019.