Thor was not an easy god to find. Not when he wanted his solitude, which she was assuming he did. The problem was that Idun was worried. She knew what had happened, and even though she knew it wasn't really her place to step in, Idun decided she had to. Something about Thor's bride never sat right with her, but Idun had never said anything. And now Thor was going to be in pain, and she wasn't willing to sit by idly.
So she bundled up against the bitter cold and set out to find Thor. At least he was predictable enough that Idun could narrow the possibilities a bit. By the time she found a clear path of broken, smashed trees, Idun knew she'd found the god she was after. She was not a goddess built for winter, and it felt as though there was a layer of frost forming around her heart despite all the layers she was wearing, but there were locals at the edge of the forest terrified by the sounds beyond the outer rows of trees, and Idun was fairly certain she wasn't about to walk into a wolf's den.
Just a heartbroken thunder god with no idea how to deal with his emotions.
She set out, assuring the men that no, they didn't need to follow with torches and crude, pointy farm tools. A torch would've helped, but she realized that a bit too late. The wind made the snow a bit blinding, but the corpses of ancient trees showed her the way she needed to go. It would all be very convenient if it wasn't so tragic. When the cabin finally came into view, Idun was convinced she'd be frozen forever. She already knew she'd leave this part out when she mentioned all this to Bragi.
Idun's hand was raised and ready to knock when the door swung open, and she jumped back instinctively, startled as she was. The hammer made confirming Thor's presence incredibly easy, and beyond that, it didn't take much to read the god's expression. If he wasn't on his way to destroy more trees, Idun would genuinely be surprised. She was letting that go for now, but come morning, he was answering for that particular crime.
"On your way out?" Idun asked, lowering her hand slightly to push her hood back instead. Knocking was no longer necessary, but she did have a bit of snow to shake out of her hair. The hood could only do so much when the wind kept blowing icy unpleasantness straight at her.