anger and prozac

my daughter who is 25 years old, has been on Prozac for almost 4 years as she was suffering from panic attacks. a few months ago she decided to stop Prozac because she didn't wish to be Prozac dependent all her life. Since then she has become very irritant and angry towards her family and friends, i have tried many times to open a heart to heart dialogue with her in order to bring this to her attention and hopefully to work with her to ease this anger, but to no avail . I am very worried about her and would appreciate some advise on how best my wife or myself should deal with this anger. Thank you very much for any advise you can offer. Best regards N.