A couple tips to avoid breaking the game:
Don't go into the Options menu and click out. It'll start the game, skipping the name entry field, and as soon as it enters dialog with your character, it'll crash. This is fixable.
Do NOT click on the locked dresser in Sansa's room until AFTER you get her key much later in the game. The locked dresser, when clicked, will unlock whether you have the key or not, but if you do it too early, when the quest comes to open the dresser and steal the panties, the quest trigger won't activate and you'll be stuck in her questline, and you need to restart from the beginning.
Other tips:
The rabbit pelt Sansa is looking for is an Auburn Rabbit Pelt. It's a reddish rabbit, very rare, but it's there.
The elk also exists. If you catch it in the forest early, SAVE THE MEAT. You'll need it for a quest.
The Needle sword handle is under a bench in the sewing room (back left door near the archery range in the keep), and the blade is in the storage room on the floor in the left corner between the crate and wall.
Sansa's sleeping potion requires the following ingredients: Three herbs from the forest (just click), a wine bottle from a table in the dining hall, and a book from the library.
The other book you need to repair and assemble has pages scattered on the floor of the storage room, under a table in the dining hall, on the ground near the torch in the archery area, and the cover is found on the ground in the marketplace.