I wrote a coming out letter to my best friend (whole lives out of town, btw, so I rarely see her) through email, and at first she was very supportive, and we texted about it for about a week, when she all of a sudden stopped talking to me. I haven't talked to her since early December. I think this was a mistake
Have you ruled out anything more likely than "she secretly hates you now" yet? It could be that she couldn't pay her phone bill.