Criticising a Bipolar sufferer

I have a bipolar girlfriend and love her dearly. She has hurt me emotionally today and she seems unable to recognise this. i accept the situation and do not want to cause her upset or stress but also feel that if she is to take ownership of her life and manage her illness, as she wants to do, she has to recognise action / reaction in social situations and relationships. How can I try to help her understand without compromising her achievements in managing her moods?