1. Ask her if she wants a drink because she may be tired.
2. Ask her if she wants to take a break because she may be tired.
3. Tell her to keep pushing forward because they may simply not have motivation.
4. Encourage her by gestures (like a high five).
5. Ask her if she needs help/advice because she may not be sure what to do.
6. Make her feel appreciated by pointing out what she has done right.