Like it or not this is where you are. These people are not your friends, they are service providers with whom you are friendly. Step back and treat this as a business relationship. Stop making excuses for their lack of knowledge and sketchy “staff”.
But I got a hunch about a situation but unsure of the details between BOs and daughter. You mentioned a “divorce 9 years ago”? Whose child is this? How long has she been living and working there?
By what you share, the only new part of your boarding experience is the daughter. Children of divorce can be manipulative and a parent is going to stand behind what their child’s version of the story is. Not yours. Be careful what you say to daughter, it’s going right to BOs, possibly edited, she may be playing you against them and dramatizing. Again, based on what you shared, shes already proven herself irresponsible and who knows what else.
This has been a leading reason over the decades why I have left barns, BO family issues that spill over into horse care and ability to TRUST BOs.
The approaching a loose horse that is eating with a blanket and throwing it over them is asking for it. Your horse, your property your (questionable) choice. Somebody inexperienced being paid to care for somebody else’s horse, no way. So if your horse knocks her down or kicks her in the face? You may be looking for a new barn ASAP.
This might be a good opportunity to review your boarding contract. It is current, right?
Anyway, I give barns 3 strikes. You got one obvious strike here. Strike 2 is under review. That would be blaming the horse. Real horsemen NEVER blame the horse for bad care or handling.
Also, might be tacky but since DD here cant stay in school or hold a job, is there a possible substance abuse factor? Have that in my family, they lle. All the time. Different story to each person but you cant tell by looking at them. Seem normal. That has been an underlying cause of slipping care at barns I have left.