Not True
GRRM does a good job misdirecting us in such situations - I certainly never twigged what was about to happen

One thing is for certain in TWOW, whenever a wolf starts acting funny....
Because she's a horrible person. She might have a veneer of courtly courtesy, but underneath it she's a bitter, spiteful woman. Her treatment of Jon is disgraceful - is it his fault he's Ned's bastard? She tells herself she's forgiven Ned, but its not true, she's merely transferred her hate and resentment to Jon.
She treats Robb like a child, not like her king. She constantly,
constantly, when in his presence starts thinking of him as a baby or young boy, sometimes even saying those thoughts out loud. She constantly undermines him, sometimes in front of others. She disobeys him. If she weren't the Queen Mother, her head would be on a spike for freeing the kingslayer.
Her treatment of Edmure is even worse. I have yet to figure out quite why she treats him so badly. Every time they meet, the first exchange is always a greeting from Edmure and a rebuke or spiteful comment from Catelyn. She gives him no credit for anything, puts no faith in
anything he plans. Although factually speaking he is not Lord of Riverrun whilst Hoster Tully lives she bristles with anger and resentment any time someone refers to him as Lord Tully, he is in effect the acting and rightful Lord of Riverrun and the head of her house.
Finally she makes a string of terrible decisions. People talk about Dany being a terrible leader, but she's got nowt on Lady Stark.
Believing Lysa's letter - WRONG
Forcing Ned to go to Kings Landing - WRONG
Going to KL and trusting Littlefinger (who has had 15 years to brood on his humiliation by House Tully - WRONG
Kidnapping Tyrion - WRONG
Going to the Vale - WRONG
Arranging the marriage alliance between the Starks and the Freys - OK, she actually did a great diplomacy job here and she can't really be blamed for the fact it turned into an epic FAIL
Going to arrange a peace treaty with Renly and Stannis - FAIL
Repeatedly disobeying Robb and Edmure's requests/orders to go back north - WRONG
Leaving her crippled son and emotionally unstable son all alone with no family and no leadership in Winterfell - WRONG
Freeing Jaime - so WRONG I can't even begin to put into words, even though it is the beginning of Jaime 2.0 for the reader.
People talk about how bitter and vengeful Lady Stoneheart is. Fact is that Cat was already like that long before the RW. As I do my re-read and add notes as I go along, my Catelyn chapters are full of "No!", "Wrong!" and "

!"