klmno,
Many times a difficult child is released to another therapeutic placement straight from the hospital or Residential Treatment Center (RTC) (or whatever setting is applicable); not from home.
Having said that, there are therapeutic group homes that are good; there are some exceptional therapeutic foster homes (fewer & far between).
wm left Residential Treatment Center (RTC) 3 years ago now & went straight to the therapeutic group/foster home. We've have an exceptional working relationship with the staff & foster mum & dad there. It helps to sit down & work out the plans & the rules of the house. husband & I have to respect those rules as well.
As to the ativan ~ it isn't a quick acting agent. in my humble opinion, you need to take it on a regular basis to get the best reaction from ativan. (I take it myself here, so cannot comment on the reaction in children.)
kt takes seroquel as a PRN medication; the best PRN medication she took was Zyprexia (it melted under the tongue, sedated her for a bit, then she evened out). It is, however, one of the newer anti-pyschotic medications.
Keeping fingers crossed that difficult child remains medication compliant & things settle down for you & yours.