Love and Logic and 1-2-3 Magic aren't my favorite books because they 'train' kids on behavior instead of TEACHING kids how to make good decisions. I want my kids to grow up being able to make good decisions and be skilled at problem solving, not necessarily good at following someone else's directions.
Besides the "How to Talk" book, "Mom, Jason's Breathing On Me" is good. Both are fun to read too. You may want to check into "Reviving Ophelia" since you have a girl. Depending on how much you like to read, "Kids, Parents and Power Struggles" is one more suggestion. All of these should be available at the library too.
One other thought. Since you're on a break from your therapist, this may be a good time to check out other therapists and find out what they have to offer. Since she is a tween now, perhaps another person would be better skilled with her age group. (I have no idea how good your present therapist is, so take this or leave it)
Good luck! Listen really hard to what she's saying, be sure she knows you are hearing her - even if you don't agree, let her know that you understand what she's telling you then go from there.