My mother in law was drunk while being only person in charge to watch my baby

Please help, anyone with experience with family who has an addiction to alcohol..

My mother in law was watching my 14 month old and risked her life. I'm going to summarize because this could be a novel.

My daughter was found with my MIL, both going down the pool slide at her home both fully clothed not in swimsuits. My baby was screaming to the point the yard guy was concerned. My brother in law's girlfriend lives close and happened to be at the pool and immediately took my daughter (thank God), noticing my MIL was not talking properly. Slow to get up and seeing things. She said she saw a man (a red bucket in a distance) had a gun and was going to get her.

Fast forward and she's admitted to a behavioral detox hospital. At this point we think it's a tumor or stroke. (MIL didn't want doctors to tell us anything HIPPA law) Everything comes back fine except her blood alcohol level was .214. HOURS (we find this out before we weren't allowed to know anything) AFTER THE INCIDENT.

Our family is devistated to say the least. My husband is broken and shocked. As her son and as our baby's father.

My MIL was in denial immediately. She doesn't have memory of what happened and admits to my husband she "had a drink" while my baby was napping. She says she doesn't have a problem.

It's been a few weeks and now she admits to having a problem and wrote us a very apologetic letter. Obviously she will never babysit our child again. I still haven't seen her or had my child see her.

I know an alcoholic is always an alcoholic. Always going to meetings and fighting the addiction. I need advice.

When should I see her and when should she see my child again? Immediately I said after rehab, etc... My husband is in the middle and alone because it's his mom. Today he's going to confront her about the letter and we talked before and was mentioning this question I have. When will we move forward? She will always struggle. But I'm telling him a letter does not fix it. I need proof she is on the right path and I cannot put a date on that.

Help please.