I would consider no response at all to the text. Personally I wouldn't respond to any text sent at 4am.
If she brought it up again, sober, in an authentic and meaningful way (which is up to you to evaluate), maybe that is a good time to have more of an open mind.
Please start a new thread and link both of them together.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
