A glamorous influencer who tragically drowned during an Ironman event in Texas had been suffering from the flu but chose to proceed with the demanding race despite friends urging her to withdraw, according to a close acquaintance.

“She was unwell before the journey, not in good shape,” shared Luis Taveira about his dear friend, Mara Flávia, 38, who lost her life during the event held on Saturday in The Woodlands.

Taveira recounted to The Spun, a sports website, “My wife and I advised her against racing due to her weakened state, but when we spoke two days prior, she insisted she was fine,” referring to the Brazilian influencer.

“I’m still in shock over what occurred. She was battling the flu,” he lamented.

Despite her illness, Flávia continued to “train hard,” even though she was noticeably “weakened,” Taveira added.

In an Instagram post just two days before the race, Flávia shared an image of herself donning a pink swimsuit and cap, poised at the edge of a swimming pool.

“Just another day at work,” she wrote in Portuguese.

Her Instagram account was peppered with snaps, showing her working out in a gym, by the pool, or running outdoors.

“Not every victory is photogenic, not every growth is pretty to watch. Sometimes evolving is being silent, stepping back, saying no, crying in the background, and coming back the next day more aware,” she said in one motivational post.

In others, she said that skill “only develops with hours and hours of work” and sport is “the best tool for transformation.”

The Ironman Texas competition features three legs — a 2.4-mile swim, a 112-mile bike ride, and a 26.2-mile run. The women’s event got underway just after 6:30 a.m. Saturday, with fire crews alerted around an hour later that there was a lost swimmer.

Flávia’s body was found around 9 a.m. in about 10 feet of water.

Officials have ruled her preliminary cause of death was drowning, and relatives have paid tribute.

Flávia’s sister, Melissa Araújo, said her sibling “lived life intensely” – and revealed a piece of her had vanished, People reported.

“You were always synonymous with determination, with courage — with a strength that seemed too vast to be contained within you,” she wrote on social media.

“You never did anything halfway; perhaps that is why you left such a profound mark on the lives of everyone who crossed your path.

“A piece of me is gone, and I will have to learn to live without it. And it hurts in a way I cannot even explain. 

“It is a strange silence, a void I knew existed all along — as if the world itself had lost a little of its color.”

Flávia’s partner, Rodrigo Ferrari, described the swimmer as his “love” and said not waking up next to her was hard.

“Ursa, you were the best person I have ever met in my life,” he wrote in a note shared on social media.