The U.S. Postal Inspection Service said it's also still investigating Coles' disappearance.

\"We continue to urge the public to contact the U.S. Postal Inspection Service’s hotline at (877) 876-2455, if they have any information related to her disappearance,\" a spokesperson said.

For Phillips, the daily pain of not knowing what happened to her daughter is unbearable.

\"Not even my worst enemy would I wish this type of pain on,\" she said.

\"PHOTO:
U.S. Postal Inspection Service
PHOTO: Reward poster provided by the U.S. Postal Inspection Service requesting information leading to the location of postal worker Kierra Coles, who has been missing since Oct 2, 2018.
>

Phillips urges anyone with information to come forward.

\"I just hope somebody just has a heart and calls in, or gives a tip. Anything they may know, even if they don't think it's important enough -- any small thing could lead to breaking this whole case,\" she said.

Phillips vowed, \"I'm not gonna let up until my daughter is found.\"

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