Sure, Gretel had problems of her own- they all had problems of their own here, but besides her culture and technology issues, her only big angst was Hansel's absence. Sam was there for her when she needed someone the most. Now she was doing the same, and that's what she meant by 'where else was she going to go'. She wouldn't be anywhere else but there.
She was a little worried about what she'd see in his eyes when she told him, even held her breath without realizing it until he made no attempt to recoil or leave. That acceptance meant more to her than he would probably know, but those feelings were for another time.
"I won't argue with you on that," she nodded in agreement, but still leaned in a little, her hand sliding from his back to under his arm, draping her's over it so they were linked, and shoulder to shoulder. "But it's a chance he didn't have before you walked in my door." Gretel leaned into him, giving his arm a squeeze that lingered.
"I will try everything I can," she told him. "I know it does nothing for the loss of your friend. From the sounds of it, she gave her life in the same way you or Dean would for her, if she'd been the cursed one... It is a choice all those like us make for those we love." Gretel sighed softly, leaning the side of her brow against Sam's shoulder. Comforting. Sheltering. Above all, reminding him that she was right there.
"Those of us still alive feel the hurt all that much more... that we forget we would do the same in a heartbeat."