How do you do it? I checked the wiki site and it said she was bugged, and offered two console commands that were suppose to work but did nothing

I got an amulet of Mara (added it via console command)
I talked to Maramal and the Temple of Mara
I wore a Amulet of Mara and talk to Lydia (No new dialogues came up)
Then I resorted to console commands while she was targeted ("E Talk Lydia" was on the screen)
First I did addfac 00019809 1, then did setrelationshiprank player 4
I had the amulet equipped during every attempt to gain the dialogues, and during the console commands. Nothing is working, I'm kinda PO'd at the moment.

Any Help?

Lydia won't be marriageable until the next patch.

Oh well, suppose I will have to wait, thanks for the update.

Also, a found Amulet of Mara can be buggy at times. Try buying one from Maramal.

Also try dismissing Lydia and then open the console and click on her. Then type the console commands you already used (I found setrelationshiprank 2 was enough for marriage). The close the console and try talking to her again with the amulet on.