I second ByTheSea's post. I raised my ex-stepDD from age 7.5 until my marriage broke down when she was 13 (marriages often do this where Attachment Disorder is concerned, sadly), and even after that I was very involved in the rest of her upbringing until her father decided he could no longer live with the aggressiveness that was now transferred to him (had all been targeted at me previously) and had her removed from the house a few months after her 16th birthday.
I know FAR more about Attachment Disorder than I ever wanted to, I struggled and fought to get help for her and her younger brother who in turn has psychological issues of his own due to the treatment he received at her hands over the years. I've been through endless parenting and attachment therapy with her, none of which worked as by the time she was properly diagnosed she was really too old to be able to "heal". I struggled and fought to be heard by everyone - her school(s), parents of the children she abused, fought with, ganged up with (or on), the police (who wouldn't help one bit), social services (ditto until they were forced to eventually, but years after it would have helped us), my (ex)husband who for a long time would never believe there was anything the matter with his precious firstborn - and STILL doesn't want to believe it, even though she uses and abuses him over and over, even now.
I also found a couple of excellent EBD schools for her, but sadly the LEA in which we live(d) refused to pay for her there, and the CAMHS area she was in said it was down to the LEA. We tried to get her statemented at school to obtain specialist support for her there, but the school immediately closed ranks as soon as we suggested it and insisted that it wasn't necessary. Again, I was informed off-the-record that it was down to a funding issue.
None of this helps you, I know - but I can recommend some good books and some support forums that might help. I would say that just not being very good with babes wouldn't result in Attachment Disorder I think (but bear in mind I'm a layman, not a psychologist - although I know a damn sight more about it than some of the psychologists who thought my stepDD was "just a normal teenager" ... !), but it does sound like your DD and yourself might benefit from some attachment work together?
My stepDD has Attachment Disorder from being abused physically and mentally by her mother from about the age of 18 months to 4 years old, and it's sad beyond belief what it's done to her life as a result. As ByTheSea says, all the love and caring in the world weren't able to repair the damage done to my stepDD, and myself and my (ex)family were irrepairably damaged to the point of us being torn apart from the strain of life with her.
Don't let this go any longer, is my advice - get out there, find someone sympathetic/empathetic enough who can help your DD and yourself heal whatever issues there may be.
Again, I don't profess to know all there is to know about attachment problems, I've just had almost 10 years now of bitter experience of trying to deal with it, and the systems that are supposed to be there for support but in reality aren't!