1) Haruna is 100% human so very much yes. However, she's a fun seeker (saying strange things on purpose and anticipating what kind of reaction she'll get) so it might be... weird to figure out whether she's really stressed out or just overly excited. Unless Hawke would know the difference, then that's your call~

2) Definitely!

3) Go right ahead!

4) She's pretty good at controlling her body language, but Hawke could probably still catch her no problem.