The family of missing Mannum woman Jody Meyers has pleaded for their sister, daughter and mum to come home, or for anyone with information on her whereabouts to come forward.
They have become seriously concerned for the 20-year-old's welfare after being unable to contact her for more than two weeks.
Her older sister, Tania Parsons, said it was unusual and out of character for Ms Meyers to be unreachable for so long and to have left her two-year-old son behind.
"We are really worried something is not right; Jody wouldn't have put us through this," she said.
"She's loving and caring, and dedicated to her son; she would never go anywhere without Elijah.
"We would do anything to get her home."
Police issued a public appeal for information in relation to Ms Meyer's whereabouts on Saturday, after relatives filed a formal missing person's report five days earlier.
Major Crime detectives and police from Murray Bridge began investigating her disappearance on Monday, seizing items from her Mannum home and speaking to her partner, family, friends and neighbours to gather any information that may assist in finding her.
Police said while there were serious concerns for Ms Meyer's safety, a text message sent from her phone on Friday, August 28, showed that she may have wanted to spend time on her own.
The message informed her family that she had left her partner, was spending time with friends and would make contact in the near future.
But sister Sarah Meyers believes someone else sent the message from her phone, which has since been switched off.
"I don't believe it was her writing it," she said. "It's not Jody, she's always got full stops, always got commas, and has no spelling mistakes.
"She would have said who she was with, she wouldn't have just said friends."
The last time the women saw their sister was at their stepfather's birthday celebration, which was held at a property on Bowhill Road, in Burdett, at about 7.30pm on Wednesday, August 26.
Records show her bank card was used at a Mannum automatic teller machine on Thursday, August 27 but no further traceable information had been obtained.
"I get into bed every night and I feel guilty because I don't know if she's warm or even safe," Ms Parsons said.
"Jody, if you're out there, let someone know you are okay.
"If someone else knows something, come forward; someone has got to know something."
Ms Meyers is described as being caucasian, 154cm tall, has a solid build and wears a hearing aid in her right ear.
She has green eyes, a fair complexion and long blonde hair.
- Details: Anyone who has seen Ms Meyers or has information on her whereabouts is asked to contact the SAPOL Assistance Line immediately on 131 444.