"Thriving," she captioned the post for her more than 282,000 followers, alongside sun and sparkle emojis.
Fans quickly reacted to Ash's photo, applauding her for looking "so happy and healthy."
"Ma'am, you look so happy and healthy," one Instagram user replied to the photo. "I love that for you so much. The bikini is fire, the hat is fire, you are fire."
"It's the hat for me! Yes, girl! You look amazing. Do you!" another wrote, while someone else added, "Love the confidence."
One fan wrote: "Looking great and healthy," while another chimed in, "Not only do you look amazing, but you look happier!"
"It’s honestly Lauren’s world, she’s just allowing us to live in it," someone commented.
"You know what's fun? When you're living in a larger body, people post that they're concerned for your health. Then, when you transition into a smaller body, people post that they're concerned for your health. Starting to feel like there's no winning as a woman," she penned alongside a photo of herself in a cropped, white tank top, black leather shorts and black high heels.
"To the people who have DMed me this week telling me I'm no longer a role model because I lost weight, I guess my question is, why was my body the only thing that gave me value as a role model?" she asked. "I've never once promoted weight loss, nor would I ever. I just happen to be in a body that's smaller right now than it was a year ago. And God willing, if I'm privileged enough to walk this earth for a long life, my body will expand and contract and change many times over."
Ash explained that there is no "secret" to her significant weight loss.
"To the countless people asking me my 'secret,' please stop. There is no secret," she wrote. "I removed stress from my life. That's it. It's amazing what our bodies hold onto when in a prolonged state of stress."
She concluded by sharing that she is "confident and happier" in her body since her weight loss, and pointed out that a man wouldn't no longer be considered a role model for losing weight, so neither should she.
"I’m more confident and happier than ever before in my life and I enjoy commemorating that with fashion posts and all that fun stuff. If you don’t like it, and it’s upsetting to you, please unfollow and no need to inform me that you did. I honestly never expected the vitriol I’ve experienced over the past week simply because I’ve lost weight," Ash continued.
"You have no ownership over my body. Nor do you over any person in the public eye. And honestly? Would you ever tell a man he was no longer a role model because he lost weight? Exactly."