Hi Ladies
My daughter is 18, her father was absent and did not pay maintenance either since she was 2. When she asked about him I answered her questions honestly. Two years ago he entered her life briefly and she got to know her half brothers a little better. They are older than her and they keep in contact via facebook. She is a very talented and bright young lady, and when I asked him to contribute to her expenses, he told me that we only worry about money and that all she wants from him. After that she did not contact him again, and neither did he make an effort. She saw him late last year at his mothers funeral, where he bragged with his beautiful talented daughter. She told him, in front of everybody, unfortunately he had nothing to do with the person she became. She asked me to call him with her matric results, which I did. He promised to call her to congratulate her personally, which he didn't.
Back to your situation:
Don't push to issue, if she wants to know her biological father, don't stop her, and answer all her questions honestly. She has your hubby as a father figure, and obviously that's enough for her.