Try that trick of making her the subject of every sentence. Then you can go back and smooth it out, but this will keep you on the right track.
Also note the "she is this and I know because of this concrete experience."
I'm known for my recommendations, and I believe the secret to my success is to try to give a (short) version of a concrete example of the character trait/work habit I am trying to tout.
In other words, I provide evidence. It makes the assertion "She is reliable and you can count on her" even more powerful when I say, "even though she was a freelancer, she moved a personal appointment when a sudden crisis workload hit our department so that she could be available." See?