When should I tell her?

I am talking with a girl for two months now.She's not my girlfriend yet but things are heading into the right direction.Should I tell her now about my PIED or should I wait  till is something serious?

I feel like if you are having more serious conversations and opening up to each other then yes. The fact that you are concerned/ considering means things are getting to a point where you want to be honest and open. Also if you are becoming more physical communicating this might be important so she is aware of your reboot and doesn't unknowingly do something to trigger or hinder your progress.