argh that sucks! but like everyone has been saying this is her insecurity and NOT a reflection on you on who you are. Also it's funny because friendships can go through challenging times when a situation changes. i know that i have experienced ups and downs based on things like relationships, jobs, babies etc. but is always a good chance for reflection and solidifying of rock-solid relationships and in some cases a good chance to 'clear out the stables' so to speak.

hopefully this reaction by your friend was just a storm in a teacup and once she gets used to the idea of seeing you as a different person (ie without husband) she'll settle right back in and you guys can get back on track.