How to have a healthy relationship with someone who has a PTSD?

I have no qualification to give you reliable advice, but I think the whole "I want it to work, I adore her so much" will be quite helpful by itself. You'll be there for her when she needs you, and that's most important.

My experience (limited to a different problem, but hopefully similar enough) also says this: You should also leave her alone when she needs that. Not forcing yourself onto her is probably important for her to allow you to really get through to her.