This is really well done. I love how artists are still keeping this arc in mind.

Cozy Glow: “Hello, Princess.”  
Princess Celestia: “Hello Cozy, would you like to look at this picture with me?”  
Cozy Glow: “No.”  
Princess Celestia: “Repeat picture.”  
Cozy Glow: “So, this is what you’ve become.”  
Princess Celestia: “I just need to watch this. I think I have a way; a way to bring him back right this time.”  
Cozy Glow: “The authorities are hunting you now. If I found you, they will too.”  
Princess Celestia: “I just need a bit more time.”  
Tw AI light: “NO! You’ve had your fucking time! You have to answer for what you did: to Nightmare Moon, to Sunset, To Cozy Glow, To me, And to Him: To Sombra!”  
Princess Celestia: “…Hello, Tw AI light. Did you come all this way to see me?”  
Tw AI light: “I’m here to remember what you’ve done. Somepony has to!”  
Cozy Glow: “Tw AI light…”  
Tw AI light: “Not all of us got off Scot-Free, Cozy Glow. She was”  
R AI Rity Tw AI light: “Brilliant, and we”  
Flutter AI Tw AI light: “Trusted her! But she”  
AI pplejack Tw AI light: “L l l Lied, t t to us! She twisted and”  
Pink AI Tw AI light: “Tortured us! And used us!”  
R AI nbow Tw AI light: “Manipulated us for her own purposes! And for what?! For This?! This… Shadow?!”  
Tw AI light: “…She needs to pay.”  
Sombra: “Celestia. I have to go…”  
Cozy Glow: Removes her helmet to look down at Celestia crouched by the picture in-front of the dimensional mirror.  
Princess Celestia: Slowly removes her crown and sets it down next to her.  
Sombra: “…And don’t worry…”  
Princess Celestia: Slowly looks right up at Cozy Glow, sadness, sorrow, and lifelong weariness written all across her face, as she looks up into the eyes of hers and Sombras’ daughter.  
Sombra: “You’ll see me again soon…”  
Cozy Glow: Remembrance… Hate… Resent… Pity… Acceptance… Forgiveness… All of these emotions wash over Cozy Glows’ face in under thirty seconds, before she bends down slowly to place a kiss on her mothers’ forehead.  
Sombra: “Ready?”  
Princess Celestia: “…Just a bit more time…”  
Cozy Glow: “Come on, Tw AI light. We’re leaving.”  
Tw AI light: “I thought we came all this way; to kill her!”  
Cozy Glow: “Tw AI light, remember what you’ve learned in the memory unit? You need to let go. Your past doesn’t define who you are, it just gives you the starting point for who you are going to be.” Turns to walk away, only for Princess Celestia to reach out with a hoof  
Princess Celestia: “Cozy Glow?”  
Cozy Glow: “Yes, Princess?”  
Princess Celestia: “Would you be so kind as to leave me your pistol?” Cozy Glow unclips her pistol from its’ holster and places it on the table next to Celestia. “Thank you, Cozy Glow.”  
Cozy Glow: “Goodbye, Ma’am…” Slowly walks away.  
Princess Celestia: Turns back around to slowly look at the pistol on the table. “…You we’re my greatest creation.”  
Tw AI light: “…I don’t know what I am. But I do know this: I’m more than just a copy of you… I’m better than you.”  
Princess Celestia: “…I wasn’t speaking to you…” Tw AI light simply turns and floats away after Cozy Glow, leaving Princess Celestia all alone inside of the room.

And I thought that Sombra from season 9 had a very bad fate, but then I remember this (Good) Sombra and I realize that I was wrong.
 
Poor Princess Celestia.