I'm kinda with cherryblossom on this one, though I've just noticed that you have already resolved this some, but I will add my two cents anyway...
Your friend has a right to her healthy boundaries, and something may have been going on for her that you didn't know about, which made it hard for her to hear what you were sharing. At least she was honest with you. That's the sign of a good friend, not someone who is abandoning you. I'm sure it was unpleasant to open up like that only to hear that she couldn't take it, but that is how things go sometimes.
I have a friend who is the sort of person everyone goes to with their problems. He reminds me of me when I was younger actually. Recently, he had a friend open up to him and share the most horrific childhood atrocities with him, and my poor friend wanted to run and hide and it took him about a week to replenish the energy that was depleted from this man spending the entire day unloading his childhood trauma onto him. My friend didn't lay down healthy boundaries with him. He didn't also think of his own welfare, and paid the price.
This is hard stuff for you to have experienced and processed, and very risky to share with others, but there does need to be some understanding for how it can also affect the person on the other end listening. I know you said that you did, so I'm sure you know all that.
It made me remember when I had to put up a boundary with a woman I thought was a friend last year. She was always calling me up and sharing her feelings and problems with me, and I was ok with that to a certain degree, until she one day sent me a text message at 7a.m telling me she didn't want to be on the planet anymore!
I woke up to this message and was fretful all day for her, as she wouldn't answer her phone. I was in tears and so worried about her. Later that evening, I saw her and shared how that experience affected me. She looked at me like I was an idiot and said she was over it!!
After another incident of her sharing stuff at inappropriate times, with no understanding of personal boundaries, I was forced to erect some firm boundaries with her...which she didn't like at all and abused the hell out of me for it...for asking her to not send suicidal messages at that early hour if she knew it was a passing feeling and had no intention of acting on it.
My point is that people have a right to give what they can and to also choose when they are not able to give, and it can be distressing for someone who chooses to open up to them. It doesn't mean your friend doesn't care about you though...she's just taking care of herself as well...which she is entitled to do.
