She went on to clarify how the injuries came to be, writing: "No I didn’t get punched in the face or fall off OR get hit with a skateboard or surfboard.
"It was a horses head to the nose. By accident. Oweeeee."
Estelle ended the post by asking her followers for advice and apologising for taking a break from posting.
Quick to share support for their friend were multiple of Estelle's former Big Brother co-stars.
"Yikes❤️❤️❤️❤️❤️❤️," Farmer Dave commented, to which she replied: "Its an owww from me Sonia."
"Jesus dude.. you okay?" Trevor Butler added.
"Yeah man. You should see them today wow. Just painful," Estelle responded.
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Two-time Big Brother winner Reggie Bird, and close friend of Estelle's in the house, also shared her condolences, commenting: "Oh my goodness @estelleey when is sh-t gonna stop happening to you! Love you ❤️❤️❤️."
Estelle first appeared on Big Brother in 2012, the ninth season of the franchise, ending the season in third place.
She returned to the house in 2022 for a second chance at the crown.
After being saved from a double elimination with Reggie and given a second chance by Big Brother himself, Estelle failed to beat newbie Taras and was voted out by her fellow housemates.
Reflecting on her journey on Instagram, the star wrote: "Hard to go out the way I did but at least it was with an open heart.
"I tried my best to play with kindness and with strength and compassion."