Out of Sight by Viola Grace

Ted makes her living by creating apps for businesses who need something specific. She keeps in constant communication with the businesses she works for one precise reason: the moment she is out of sight, they forget she ever existed. It has been difficult to live with, but she has worked with a number of her family members, who recognize her the moment they see her and forget her when she turns a corner.

She's working for her cousin Sabin when he and Nora finally take steps to contact people who can help. It seems that people who know magic have moved into the neighbourhood, and they are willing to help. Ted's not going to be left alone. She even has a bathroom buddy if she needs it.

After meeting some of the strangest people she had ever met, she's finally back and memorable. When she heads back to her apartment, she is fielding years of family contacts who suddenly remember her, but one is missing. Her cousin Lucia.

Ted sends a contact to Lucia and is shocked to learn that she wasn't the only family member who had a brush with the shadow mages; only Lucia had disappeared a decade ago, and she had lost her physical form in the process. This is going to require specialization. Good thing Ted has new and weird friends who are happy to help.