The brother of an Australian woman missing in Mexico revealed his two-year-old niece was 'dumped' at a local church by her father - as her emotional Facebook posts emerged.
Daniel Shanks said 'three eyewitnesses' saw Jorge Aguirre Astudillo leave his daughter Adelynn Shanks outside the Chapel of the San Archangel, in Cancun, on Sunday evening.
Shortly after 'Addy' was found, authorities issued an urgent alert for the little girl's mother Tahnee, 32.
Ms Shanks had been holidaying around the Yucatan peninsula and was set to return to Australia after her relationship broke down with her partner Mr Astudillo.
'We have got great concerns for our sister and we are doing everything we can to get her home safely,' Mr Shanks told Sunrise on Friday.
His niece is being kept in an orphanage while Mr Shank's mother Leanne and brother Ben intend to catch a plane to Mexico as soon as possible. In a twist, Mr Shanks is unable to travel because he is unvaccinated.
The distraught brother revealed Ms Shanks had stopped using social media days before she went missing and that she had made several posts alluding to love, heartbreak and self-motivation.
One post included a poem describing a woman who had lost her 'spark', another was a song discussing failed relationships while another post listed 'Ten Painful Truths'.
Ms Shanks also gushes over her family and uses a photo of her daughter as her profile picture and snapshots of family celebrations for her Facebook banner.
Daniel Shanks claimed 'three eyewitnesses' had seen Jorge Aguirre Astudillo (middle) leave his daughter Adelynn Shanks (right) outside the church in Cancun on Monday (left, Tahnee)
Tahnee Shanks, 32, (pictured right) originally from the Whitsundays, Queensland, is missing in Mexico where she was holidaying
The brother of an Australian woman missing in Mexico revealed his niece was dropped off outside a local church by her father before she was abandoned
In several photos, Adelynn is seen at a farm with her family and feeding a goat through a milk bottle, milking a cow and petting animals.
'Look, it is very out of character, she is always on social media, she is always posting photos of her and Addie constantly, it is a constant stream of it, so for her to drop off, we knew something was wrong,' Mr Shanks said.
'For this to happen is just tragic and heartbreaking. I haven't slept for three days, you can probably tell and I am just exhausted.
'I can't go over myself due to not being vaccinated thanks to all our rules here in Australia so I have had to let my brother and mother go and do this for the family. It is quite scary.'
In early April, Ms Shanks had taken to Facebook to make a series of posts alluding to mental health.
On April 7, she shared a post that listed 'Ten Painful Truths'.
'The average human life is relatively short', 'You don't have to wait for an apology to forgive' and 'It's not other people's job to love you; it's yours', were among the phrases.
On April 10, Ms Shanks shared a post that discussed 'feeling down is a good sign'.
'Feeling "down" is an indication that something within you is seeking to be released,' the post read.
'Any negative emotion that is in your awareness is only ever there because it's seeking to be freed, it's not there to be pushed down, fought against or ignored.'
'Instead of fighting that feeling seek to understand why it's there. Negative emotion is often an indication that you believe something that either isn't true or isn't in your highest good, about yourself, others or what you desire.'
On April 15, Ms Shanks posted about a music video called 'Beautifully Cruel'.
The lyrics allude to a person selling their soul to the devil and failing to find love.
'You sold your soul to the devil. When you stopped believing in love, you ventured far to find it. But at last you'd given up,' the lyrics read.
The developments come as it was revealed Ms Shanks made a series of Facebook posts discussing mental health weeks before her disappearance and had been posting photos of her trip to Mexico up until Sunday
Another Facebook post references a poem about a woman who who has lost her spark and who has started to fade.
Mr Shanks said he was alerted to his sister's disappearance after receiving a message from a friend on social media about his niece.
'We've had a friend of ours send us a photo that's been posted on one of the Cancun social media sites and said, is this your niece?' he told Today.
'We were woken up in the middle of the night and
