dealing with someones paranoia

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A few months ago I met this cute girl.
we hung out a lot, and I guess I like her a lot.

She was on a trip a few weeks ago and she told me about her day before departure, which made me suspicious.
She bought some weed and on her way home she felt followed. The weirdest part is, that she had wandered about 3 hours in her vicinity, before she went home. I tried to calm her down with rationality, but she still believes that there was something going on. Maybe it was, who knows.

But since last week, she seemed suddenly really depressed. She said stuff like "do you know that feeling when your life's falling apart". On the same day we met with some other guys for a barbecue.
She arrived 2 hours too late and was kinda scared. When she sat down, she immediately took her battery out of her phone, because it would be better for her, as she said.

The same night, I tried to get something out of here, at least I wanted to know if something happened, but she refused to tell me a thing. She only said, that if she told me, I'd call her crazy.

Since that day I never heard anything from her and I'm very concerned that she might have paranoid schizoprhenia or something like that. I'm really into her, but I don't know how to deal with that.

TL;DR: Girl I'm into seems to have paranoia, or even worse. How to deal with that? What shall I say, when she tells me about some conspiracy thats going on against her?