OP I completely get where your coming from and I do know how hard it is.
You and your poor husband sound like you've reached the end of what you can cope with anymore with your daughter and that isn't surprising and please don't ever blame or doubt yourselves as parents,you sound like you've done amazingly coping for this long.Lots of parents wouldn't,I know 13 year old children that have been kicked out of the home by they're parents and they had nothing like what you have going on with they're children.
We've been having similar with our 12 year old DD for a good few years now,she's now willing to speak to someone who can help now Thank God.I know how stressful it is,it's nearly torn our marriage and family apart in the past and we have 5DC.
I know you said your daughter won't talk to anyone but I wondered if you and your DH knew that there were people that you could both talk to?They can be of a great support and can offer lots of practical techniques and help that can you use.
It's very similar to when you have a couple that are struggling within they're relationship and one wants help but the other person in the relationship doesn't want to talk to an outsider or isn't sure,places like Relate can see one person from the relationship and can offer them self help techniques and can be a safe sounding board.It's the same kind of idea with the places that help the parents when they're having struggles with teens and the teen doesn't want to be involved with the process.
Here's a few links,I hope something there helps.
www.helpguide.org/articles/teen-issues/helping-troubled-teens.htm
www.youngminds.org.uk/for_parents/parent_helpline?gclid=CPTq87rdyMkCFYoBwwod5PINcw
www.catch-22.org.uk/expertise/young-people-and-families/families-enquiries/?gclid=CK-sl8XdyMkCFWXnwgodHogC4w
www.familylives.org.uk/advice/teenagers/
www.nhs.uk/Livewell/family-health/Pages/teen-aggression-and-arguments.aspx
If I can think of any others I will let you know.
I've worked with some of the teenagers that had to leave they're homes and our 2 oldest DS's are friends with some teenagers that's familys are going through the same right now and we've had some of the teens stay with us(not one's I worked with one's we know well)to support the children and it gave the parents a break now and again and stopped the children from going onto the streets.