Family members have shared posts about her disappearance widely on social media, including in the Kai Now Facebook group with 118,233 members, but without success.
Relatives as far away as Western Australia have shared the messages.
Saunders said Angell's phone had been off since February 18 or 19.
"It's like she has vanished," she said.
"We heard that she may have gone off with some guy, but we've had a detective helping us out and he has confirmed that the guy is actually in jail."
Need update because its 2020 and new hair cut
Posted by Wharerangi Antoni Angell on Friday, 17 January 2020
More recently, two people have said on social media that they may have spotted her in Māngere with "a Tongan guy", but Saunders said they were not definite it was her.
"I'd like to believe what everyone's saying, that she's in Māngere, but until we know we don't want to be saying, 'Oh, she's definitely here in Māngere,'" she said.
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Police have appealed to the public to help find Angell.
"Police and her family want to know she is safe and well and are urging anyone with information as to her whereabouts to contact them on 105 with the file number 200227/5888," a spokesperson said.
"You can also contact Crimestoppers anonymously on 0800 555 111."