Mary Winchester is complete.
Because, like a true Winchester, shed done everything possible to save her family.
And with her return came new facets to the character.

Supernatural — “Absence” — Image Number: SN1418a_0289b.jpg — Pictured (L-R): Alexander Calvert as Jack and Ruth Connell as Rowena — Photo: Katie Yu/The CW — é 2019 The CW Network, LLC. All Rights Reserved.Katie Yu/The CW
But she cared about helping others.
And she loved her boys.
Marys cell phone is still here, and according to Castiel, Jack isnt well.
Cas finally tells them about Jack killing his pet snake, so Sam attempts to track his cell.
But Jack is jumping from country to country.
Because hes looking for help.
And he finds it in the form of his subconscious, who looks an awful lot like Nick/Lucifer.
As Jack remembers better moments with Mary, Lucy tells him, You killed Mary Winchester.
You cannot come back from that.
Jack swears it was an accident, but he knows it doesnt matter.
And thats why hes panicking.
In the Impala, the boys are trying to have positive attitudes about Jack.
(So I guess he is dead?)
And Dean… well, he finds what he calls an angel blast site.
Sam and Dean, theyre glad to have you back, Castiel told her.
Finally they dont have to be so alone.
But if he is, Dean wont be happy.
If he did something to her, Dean tells Castiel.
Then youre dead to me.
It was an absence of good.
And Cas didnt want to lose the family theyd built.
But Deans still not having it.
Not until they find Mary.
But about Mary… Rowena calls Sam.
Shes been trying a couple of tracking spells but she cant find Jack because his energy is too unstable.
Dean takes a moment to get out his anger R.I.P.
As for Cas, hes going to heaven to find Mary.
Only, when theres a knock on Rowenas door, its Jack.
He had the same idea: He wants Rowena to help him bring her back.
Jack then flashes to a memory with Mary.
Shes helping him train, trying to show him how to handle a knife.
But when Sam enters, it becomes his memory.
Mary recognizes it instantly, the look of parental guilt.
(Well, that doesnt really go for everyone but it certainly goes for Mary.)
We then cut to Sam, whos talking Dean down.
He is the son of Lucifer after all!
But he had a good soul… until he didnt.
This is on Sam as much as its on Cas.
And its even on Dean, something the older Winchester brother finally admits.
Donatello tried to warn Dean about Jack but he didnt see it.
And now, Jack is dangerous.
Instead, Duma shows up and tells him that Mary is at peace.
Apparently, she died painlessly, instantly, and completely.
Shes in a special heaven now.
Mary Winchester is complete, Duma says, a sentence I love with my whole heart.
But Jack doesnt know that.
He does, but all he brings back is a shell of Mary.
Its her body, but its nothing more.
Its the simple moments that matter most to him.
Back at the bunker, Cas tells Sam and Dean that he visited Marys heaven.
Shes with John in a place where theres no sorrow and no guilt.
Next to Sam and Deans initials are Marys, an carved into the wood.Because she made her mark.
In more ways than one.