@Woodstock

Season 9 episode 15

We have the scene with Alpha confronting Lydia at the Kingdom (they are standing by the school bus outside of the theater)

Then when Daryl, Michonne, Carol and Yumiko are surrounded by Whisperers. Alpha tells the group "my daughter isn't a concern anymore. She was weak, she never lived up to expectations"

Daryl then asks Alpha "was? what the hells that suppose to mean?" and Alpha quite cleverly steers clear of directly answering that question. (at the 1:02 mark of the below video clip)

Since Alpha speaks of Lydia in the past tense it can be assumed that the time between her confronting Lydia at The Kingdom and then wrangling this particular group is probably when she proclaimed to her group that she killed Lydia during their face to face.

At least that is how I always took that scene so it did not come as a surprise to me that now in season 10 we are getting confirmation that Alpha misled her group in regard to Lydia's fate

 

I didn't put two and two together there. When Daryl and Alpha were talking, I thought she was just taunting him with the past tense or possibly just speaking that way because she considers her "gone". But in hindsight, yea it makes sense now that we know she told the rest of the Whisperers that she killed Lydia.

 

Yeah and then it wasn't until Daryl was alone with Alpha, when she showed him that huge horde, that he was sure Lydia was still alive.