Janteyl left her home presumably to meet up briefly with the father of her child and never returns home. 

Sources:

https://www.newcastlede.gov/1806/Janteyl-Johnson

https://www.facebook.com/missingjanteyljohnson/

https://charleyproject.org/case/janteyl-danielle-johnson 

https://www.missingkids.org/poster/NCMC/1141215/1/screen

https://www.nbcnews.com/dateline/mother-fears-she-ll-never-get-answers-disappearance-daughter-janteyl-n1258445