My wife is a psychiatric nurse...so she should be able to recognize her own symptoms for what they are. But, a lot of the time, someone who is having an episode doesn't recognize it while they are actually in it. Not until after.
I agree with after the BUT.
If she has taken herself off of meds and is exhibiting signs of bipolar, I am not going to give your relationship much of a chance while she is in this state. My suggestion is to get clear boundaries and protect yourself.