Jocelyn wasn't expecting Keith to ask her for career advice. That wasn't the sort of relationship they had. They talked about little nothings and he frequently teased her or tried to make her laugh but that was about it.
Coming to her for advice was real friend territory. She had never had a real friend before so she was excited but simultaneously nervous about messing it up.
What if she gave bad advice? What if he realized he didn't like talking to her for more than a few minutes at a time? What if she accidentally offended him? She knew she wasn't the best at sugarcoating things. That didn't matter in her job but it did in her personal life.
If she could even call what she had a personal life. She didn't do anything for herself.
Jocelyn had colleagues not friends. Except for Keith. She couldn't afford to lose him so she had to do this right.