True Crime, Fake Friend

I'm trying to remember in which podcast (Spotify) that I heard this story. Sherlocks Google and ChatGPT haven't been able to give me an answer. All I recall is that this woman pretends to be her victim's old high school friend. The listener doesn't realize the truth until the victim's mother arrives at her daughter's house for a memorial service, and asks, "Who’s that woman?" The mother is interviewed and says, "It's possible that my daughter had friend I never knew about..." but she doubted it.

So, if there was a mother being interviewed, I'm thinking that the podcast was on Dateline, 20/20, something like it.

Unless I'm confusing it with another story, I'm pretty sure that the victim was an African American woman and hairdresser. (It's not about Joleen Cummings, and I don't think it was Shanquella Robinson.)

Can anyone provide details to solve this mystery?

Thanks for your help!​