My BEST friend started ignoring and avoiding me?

were both homeskooled we only c each other wed and sun unless we go 2 each other's house. last wed, she couldn't come to the cl we take that night she had 2 help her mom with preskool. soo after cl i went to say bye to her. this has happened b4, and usually she gives me a hug and says 'c u ___'. but last wed she kinda brushed me off and talked to some other girl who she usually doesnt pay attention 2. last nite she was online, so i sent her some ims. she wouldn't respond. shes never doen this b4. then 2day, in sunday skool, i saved her a seat like always cuz she arrives late. she sat next to her sister, who she almost hates. and i saw her using a silver flip fone that i'd never seen her with b4. i asked,'is that yours?' she said, 'yeah my gramma gave it to me,' and turned away. she never even told me. i tried talking to her, she just avoided me. she used to share a fone with her sis. now that shared fone is her sister's, but they lost it, so i have no number for them. she wouldn't come to youth with me, like we always do, and instead went with the other girl who she talked to on wed to where she goes, a diffrent cl. so i went to youth and sat with my other friend. after that i went to my mom's sunday skool cl, which happens to be the one the other girl goes to. so my best friend was there, playing on her dad's iPhone while her and my parents chatted. i asked her what game she was playing, she didn't answer. then she had to go, so i said 'bye, Amy!' she mumbled 'bye' and left. then she and her sister showed up a little later while i was helping my parents pack up, and Amy acted like nothing was wrong. so later, we're leaving. then i remember that Amy's fone number would have changed. so i'm wandering the church looking for her. i see her peeking through a door. as soon as she saw me, she took off. she's avoiding and ignoring me! why? what did i do? last sunday everything was perfectly fine. she wasn't any different. it all started last wednesday! to my knowlage, i've done absoulutly NOTHING to offened her. nothing. her sister Kayna and her two brothers, Karub and Bradakeyz, acted the same as they always did. Kayna talked to me the same. and her parents acted the same. it's only Amy! she's been paying Mimi so much attention! what did i do? why is she ignoring me? we've been best friends for years. telling each other our darkest secrets. closer than sisters, almost! she's really hurting me. i know it sounds lame, but the first time, wed night, i cried myself to sleep. now i'm crying as i write this, because Amy's online and she won't answer me. and i'm really hurt! why would she do this???