It took my wife about 6 years of telling me there was something wrong, getting diagnosed with ADHD (Not really just ADD with BP mania thrown in for fun) and a series of affairs ending in a night where i almost died because of a stab wound to the throat to get me to see the light. BP is a very sneaky desease because it creeps up on you over time changin how you think and see the world. Its not like i was normal one day, went to bed and woke up and was BP the next where i could say "Hey, something isnt right about me today" She sees the world and it is completely logical in her mind.
Unless she is willng to admit she has a problem then she will never get help. Many of us here have had to hit rock bottom several times over before we could see the light so to speak. Living with BP is hard enough when we are medicatied, trying to do it with no help at all is almost bound for failure.
Good luck and i hope she is receptive to seeing a doctor