Non-custodial Mom Hasn’t Seen Child For 5 Years. Now Wants To See Him?

Wondering what to do? Birth-Mom (never married, only girlfriend) left my child when he was 10months old and hasn’t seen him since. It was a bad situation for my baby. She was a drug addict and living on the streets. He is now 1 month from being 6. I have sole custody and she has no allowed parenting time. My wife and I have been raising him since he was 10 months old. She is now living elsewhere and says she is a “year sober” and wants to see him and has just filed a motion for parenting time I’m assuming. After 5 years of him knowing nothing about her, will the courts really allow her to come back into his life? That seems very detrimental.