I want to add.. it's almost impossible to have a liar live with a paranoia. Your wife was found to have opioids hiding in her purse. From what I understand, there's been no conversation about this, apart from that night where she diverted the conversation about you. With this, it's hard to give her any credibility when she can't be transparent about this issue, alone.

Is she gaslighting? Maybe. It's hard to say. Are you being paranoid? No. Trust has been betrayed and it's natural for a person to start questioning everything. That's why trust in a relationship is so important.