I hurt my best friend and I feel so guilty

I lost my best friend about six weeks ago. We're both adults in our late twenties and have known each other for 8 years. The last time I saw her, I spent the night at hers; we watched movies and she cooked me dinner because I'd had a bit of a family issue that made me upset. It was really nice and she was so supportive.

But two days later, I noticed she hadn't replied to my last couple of texts so I tried to ask what was wrong and she wouldn't say. Feeling a bit worried, I looked for her Twitter account to see if she'd said anything. That was when I discovered she'd posted a bunch of angry tweets about how she'd found out the truth about a "fake friend" who'd been writing bad stuff about her online. I was confused at first, but eventually I clicked onto what she'd found.

Basically, some time last year I got into MBTI (those four-letter personality types). I found this forum where people would help you figure out your type if you just described yourself. So out of curiosity I started listing all of my personality traits, and then I also wanted to know my friends and families types too, so I listed theirs as well. I wrote both positive and negative traits for everyone and I assumed it was completely anonymous.

But somehow, my friend discovered it. She didn't even know what MBTI was so the only thing I can think of is that she was searching for me in google and that post came up in the search results ( stupidly I had a username that I'd used for a few other things).

When I read back what I'd written about her, I was very upset with myself. I said things like she was passive aggressive, spoke behind people's backs rather than confronted them with her problems, guarded with her feelings, fickle, etc. I said some positive things too, but I understand why she felt mad and betrayed. It must have came across like a character assassination.

I can't really defend myself, but I have to explain that the reason I wrote those things was because ever since I've known her, there have been phases when she'd just cut off contact and distance herself from me for weeks or months without explaining why. Sometimes she'd take things I said the wrong way and she'd just block me from her life without giving me a chance to explain. Sometime's she'd make excuses and cancel plans whenever I asked her to meet, yet she'd still meet with other friends. Sometimes she'd avoid everyone and lock herself inside for weeks.

So anyway, I felt so guilty, I immediately apologised and told her how stupid I was and I tried to explain that what I said came from a moment of hurt and that I didn't think that badly of her. But all she said was that she could no longer trust me and that she wishes me well in the future. A week later I sent her a card and gift but all she said was a short "thanks" . Then she just stopped replying to me altogether and it's been about 3 weeks since I've heard from her. She recently deleted all of her social media sites (which is what she's always done when she's hurt by someone) after posting a bunch of quotes about how she's better off alone etc.

I just feel so horrible about what I've done and I really want to resolve things with her but I don't want to keep pushing her. Despite all the bad stuff between us, we were actually very close and had recently been getting on so well. I deeply regret writing about her in such a negative light.

Do you think I've lost her for good, or will she come round?