Was she in a coma? Was she on a bender? Was she hiding from law?
Uhmm ... interesting ... but what would change for you by knowing? You can't "want" her into behaving like a mother and until she proves herself of her own free will don't assume the best.
Jack is right, can you see yourself Acting As If she had not been gone, but just had nothing to say and did not visit? How would you interact with anyone else who you had been out of touch with, but was just seen in the area?
In a weird way, you could demonstrate some level of trust. You could trust her to let you know what you need to know. I don't think that in itself is Anti-DB. The patience this requires may be taxing. Nothing about that part is new to this forum.
The focus does not change. We are glad to see you doing so well with your son and your day to day life. Keep that up!