diagnosis / personality mapping?

My sister has been dealing with depression lately and I've been reading up on related issues and think she may be suffering from avoidant pd...she doesn't want to go to see a psychiatrist about it though. Is there any way I can gently point her towards some information so at least I feel like I've tried to expose her to something??

Also if anyone knows of any link between personality test results like Myers-Briggs or Big 5 and potential avoidant pd symptoms and could suggest some additional info I'd appreciate it...