Argument, how to move on? & Not make same mistake again?

Girlfriend told me she was feeling overwhelmed this morning with certain things, but said it was too early in day to discuss it & it had nothing to do with me.

So this evening I told her I had been thinking about what she said & that I was concerned about her. She got defensive & said she still didn't want to talk about it & it caused an argument by me bringing it up and her getting annoyed by that.

I told her I care & wanted to make sure she was ok & if there was anything I could do. She said I can do nothing & it's making her doubt whether she can tell me things in future. I feel like I am going crazy because I only asked her to be supportive & thought by not being supportive would seem like I didn't care of insensitive. Things have been strange between us since & just want us to go back to our usual. Or at least get a grasp on what to do in future.

Any input is appreciated

Argument, how to move on? & Not make same mistake again?
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