How to repair teen daughter’s self-esteem?

My 13 year old daughter has very, very low self-esteem and I don’t know how else to help her.

She was being picked on a lot at school and last year we moved across town because of my husband’s job so she was able to start fresh at a new school. Now that he new school year has started I find out that she’s being picked on again.
She lets people push her around and doesn’t ever stand up for herself and I’m afraid it’s only going to get worse when she starts high school next year.

I have already had her in and out of counseling since she was 7 years old and when she completes each course of treatment the therapists have said that she shows improvement and that she understands the tools that they give her –but she’s evidently afraid to utilize them.
We have found social groups for her so that she is around other people who share her interests in hopes that she will come out of her shell and she does fine in that capacity and we’ve also enrolled her in Tae Kwon Do so that she can build self confidence.
But she’s still allowing others to push her around.

I don’t know what else to do for her. It would be one thing if she was just shy, but I can’t understand how she is always a target for others all the time. She has problems at school, she had problems last summer with some girls she was volunteering with at a local church and now that she has started religious ed. at our own church and kids are picking on her there as well.
At this point I see it as something she must be projecting because it would be one thing for her not to have many friends, but she is being singled out.
At home she is surrounded by family and friends who love her and encourage her. I know what has caused her low self-esteem and we have confronted those issues, my concern now is getting her to see her self-worth and I’m just completely out of ideas.

I’m wondering if there might be a camp or something intensive she could do. There are so many resources for troubled teens who need help because of drugs, come from abusive homes, live in poverty, have a parent in prison, but nothing for someone like my daughter.

I’m afraid that if we don’t find a way to help her then she will end up in an abusive relationship, or resort to drugs/alcohol just to cope, or hurt herself –or all of the above.