I think your responders are right. Lying and cheating are character traits, not symptomatic of bipolar illness.

Your friend needs to be treated for her illness. She is in denial and her rebounds from
depression are a form of mania that is working on her now. She, in my view, needs
to be hospitalized so that she can be brought back to a stable condition. It will only
get worse as she continues to drink and remains unmedicated.

Hopefully, your not speaking with her will force her into rehabilitation. She is going
to lose her job if she insists on this kind of behavior. You're intelligent and being
smart about how to keep yourself away from this terrible behavior.