What should I do? If my daughter is using again

What should I do? If my daughter is using again I don’t wanna turn her into DSHS but I also don’t wanna feel guilty of something happens to my grandkids. She showed up drunk to my alcohol anonymous event barbecue she wasn’t hammered, but obviously she was drinking and then we went to an amusement park yesterday and I could tell that she lost a lot of weight and I’m like oh my gosh what’s going on with your weight loss? She’s like what’s your point mom and I straight up upset. Are you smoking meth again, anyway I don’t know what to do. Everyone says set boundaries or whatever but what happens if my grandkids are in danger

My son just got out of rehab and now is in sober living

Good luck