Should I tell my friend to stop copying me?

My best friend has started copying me or trying to outdo me! A typical thing is I said we are going to a theme park on a social networking site and she comments saying ''oh were going there tomorrow''. She always comments on anything I say about my daughters horse and how well she is doing! Everything i do she copys or goes ine better! Im not a competitive person but its very annoying I'm sick of it! Do I tell her or do I just try and ignore it?