Fear of what, her no longer considering you her friend? Ignoring the signs and distancing yourself is a sure road to the decay of a friendship, whereas you asking her what is happening is yet to be discovered. There could be a myriad of possibilities - while your assumption could be right, what if she is going through hardships (which could affect her emotional state and thus explain her harsh words), and she needs you the most now? Take the initiative, show that you care - and if it doesn't work, at least you know you've fought for maintaining it.
