She was stronger than she looked - but Jyn didn't particularly feel like dragging him up the stairs behind her. That'd probably garner the sort of curious looks that she was hoping to avoid.

Jyn absolutely was stubborn and strong-willed once she put her mind on something. He was in far worse shape than she was, and she could deal with the sharp twinge of pain. She had had much worse, after all.

The most important thing was getting upstairs and into her room where they'd have a little privacy. One labored step at a time, until the stairs were conquered and Jyn was closing and locking the door behind them, so grateful that the rickety little bed was only just a few more steps away.