well hello and welcome! sorry for the concerns that bring you here, but glad you found us.
i admire your desire to help somebody out, get on their feet and all, but i think it's possible you got in over your head on this one! just the drinking that you described is a concern, especially for anyone on a trio of medications with her history.
it's not your fault. and it's not really your place to be the booze police or try to dictate to her when she can and cannot drink. i understand why you would express your concerns, but she is going to do what she is going to do.
what type of job does she have that she stays up all night and is drinking until going to work??? hopefully not driving bus or daycare!
take your time, read around the site, especially what we call the "stickies" at the top of each section. and please remember you are NOT responsible for her. she is. and if this arrangement is not working out, it's OK to end it.