Some things that i think can help would be:

1. Be as open as possible with her, don't hide away or shy from her, make sure she is involved in your life and every aspect.
2. As her how she is, make sure you keep her feelings in your heart to, let her express herself, if anything reassure her that if you both open up with one another it will help your communication.
3. Sometimes she may need time to take things in, don't get down on yourself if she seems distant, you need to remember that this is different for her.
4. In times of chaos when things are rough and you need alone time make sure she understands that you need time for yourself, for reflection, because i know i do a lot and most people mistake it for suicidal thoughts.
5. When you have suicidal thoughts make it clear you either need her or you need to be left alone, try to ease her mind though because she does really love you, and she cares.
6. Sometimes with these relationships maybe its best if she was part of your doctor appointments or therapy sessions, i know a therapist can really help with communication, this is crucial.
7. If you feel she is becoming stressed don't panic, sometimes we overwhelm ourselves with a million and one thoughts of someone else, we have to remember that we are struggling too.
8. expressing yourself is key. sometimes though i think there could be limits so if there is something that pains her to hear maybe it isn't best to let her know right away, maybe subtly hint to her things that are happening or bothering you.
9. Suicidal thoughts, i think its best to let her know when you are at your lowest, we all need someone.
10. Continue to ask her what she thinks or feels, its good for you to know where she stands with this all.

Good luck love, i wish you the best, and if you need someone i'm here too, i know how rough it is.