Oh, I hate to hear that but you are right---you have to respect his position on this.
HOWEVER, please consider taking the foster training classes and becoming licensed. You never have to actually "open" your home if you choose but you would have the option of giving this girl respite care from her group home. It could be every other weekend, etc. And during those short visits your husband may start to feel differently about having this young woman come to be a part of your home.
Just consider it. Then you have more options but don't have to act on anything unless you want. Who knows? You may decide to provide respite for other foster families and eventually decide to open your home to placements.
Kim
__________________
Wife to:

DH-J for 5 years
Mom to:

DS-H 14yrs

DS-S 2yrs
Current Placements:
None- my little one going through terrible twos is also about to have a tonsilectomy. Ugh. If you have stories of success please pass them to me. If you have a horror story, please, I don't think I could handle it right now. LOL
Former foster son came this past weekend for his birthday celebration and one last hoorah before school starts. I was happy to see him doing better.
Former placements:

four boys!!

and FINALLY respite for one baby girl
Aunt to:
11 Nephews......when does the male madness end!
Mom for McCain