Warning: Spoiler! (Click to show)
Originally Posted by gort Warning: Spoiler! (Click to show)
There is barely ANY stoneheart in the books at all anyways (so far). After I finished them I was like "WTF?" Because of so much hype over people wanting to see a character that appeared exactly once (or twice if you count the epilogue).
It's not that simple. It's not just her appearances or lack thereof. It's about major character arcs. Granted, they destroyed Catelyn in the second seasons when they made her the stereotypical mother character reversing her dialog with Robb. In the books Robb wants her to return to Bran and Rickon and she insists that her role is with him at his war council. Somehow they decided to make her a weak character and him the kid who knows best. Blergh. Then where they took her Jon Snow storyline was vomit inducing. She made a huge mistake (as cool as it was) kidnapping Tyrion, but she was not a weak character so wedded to her maternal instinct as they portrayed her in the show. She was so much more than that.
Edited by scurvyfreedman - 11/8/14 at 11:18am
And, now on to Lady Stoneheart. It was foreshadowed in ACoK. She's dining with Brienne at Riverrun and when she recounts the deaths of Bran and Rickon (another critical detail that they changed on the show for no reason - but again weakened Catelyn's character by changing her motivation for freeing Jaime - she remarks that since Ned's death her heart had turned to stone and all she could think of was revenge.
She appeared another time. It's critical to Arya's plot. Nymeria pulls a dead Catelyn from the river and protects her from the other wolves. Then, the Brotherhood without Banners arrives and drives off Nymeria. Arya later has more wolf dreams. It's important that she has the ability to warg and especially important that she is able to confirm her mother's death.
Lady Stoneheart puts Brienne between two oaths. It puts her in a similar position to the Kingslayer in that she either has to kill Jaime or Lady Stoneheart in all likelihood.
When the Freys enter Riverrun Tom 'o' Sevenstrings the Bard from the Brotherhood is with them. He's going to allow the Brotherhood and likely Lady Stoneheart to enter Riverrun and kill them from within. It's a parallel to the Ghost of Winterfell.
Lord Emmon Frey to his wife Gemma Lannister "Riverrun is mine, and no man shall ever take it from me." Taken quite literally, it means a woman will.