hello im glad your friend has your support..i agree that its a defence mechanism. my brother is diabetic and never known him to talk irrationally or end it all..

she obviously has troubles on her mind and rather than face up to them she is looking for a reason to run away from them..she must trust you so i would get her to try and open up to you what her problems are..

its not unusal what she is doing as we are all guilty at trying to run and hide our troubles but if she doesn,t face them they shall get worse..

sounds more like anxiety too me and she needs to get on top of things soon before she starts panic attacks..she is very lucky to have a friend like you some people are not so fortunate.

I would advise you talk to her and assure her she has your trusted support and understanding and hopefully she shall open up..don,t push her for information let her think about it and put it over as more of an option rather than as a necessity.

hope this helps you. good luck.