The story was a bit hard for me to follow, tbh... seems there was a lot of drama and back and forth between you. From what I gather, you rejected her and as a result, she lashed out at you. And then it seems to have unraveled from there into a back and forth argument? Perhaps now that she is single, she is trying to rekindle old relationships.. this does happen often when people become single again. You have a right to question her motives since she had flaked out on you in the past and didn't seem to be a reliable friend. Perhaps she took your rejection really hard and it hurt her so she reacted the way she did? I don't know about any jealousy... it's hard to tell based on this story and these details.

I had the same thing happen to me several years ago, but with an online friend. We had been in close touch for several years, writing very personal, detailed and lengthy emails to each other and supporting each other in our respective life challenges. Suddenly, she stopped replying to me, out of the blue. And then I didn't hear from her for 3 whole years. She suddenly reappeared, wanting to rekindle the friendship, but I had been so hurt by her disappearance that I rejected her and as a result, she lashed out at me very angrily in a similar way as your old friend.

I would just chalk it up to her being hurt and hurtful in reply.