Reyna tends to separate herself from others, as a strong leader type who is very protective of whoever/whatever is put into her care, she feels the need to do this to make herself stronger and more reliable. She is not afraid of getting down and dirty to achieve these goals but will never break her own rules she follows. 

It's easier to get hurt when you trust too much, too many, too soon. Hence she never shows fear or worry, (or much emotion in general) in hopes no one tries in the first place. 

Trying to be her friend will be no easy task as she'll more likely treat others as a responsibility for a long time rather than an equal but not for feeling better than them or anything. It's more a sense of duty. 
Try to flip it on her and be the one to take care of her or try to talk to her about how she feels or worries etc...and she will absolutely not take it. She will instantly distrust you for trying to get too close or for some other ill intent.

Once she does trust someone she will never completely forgive failure to honour the arrangement on their end and earning any forgiveness will be long and tough. Earn her trust in the first place with caution. 
Don't misunderstand though, her goal is to earn respect not to be controlling.

HOBBIES