B..
Since she feels she needs the test, I suppose she should take it. It's very good you already have a family therapist to help the situation.
You know, I look NOTHING like my family. I got every single recessive gene. I am petite, blond haired, small nosed,green eyed. Everyone in my family is built large, brown hair, long noses, very tall, brown eyes. Just the exact opposite of me. I am most certainly biologically from my parents. (There was never a question, they have both been faithful spouses.) My husband is 5'9 and had bright blonde hair before he lost it at a really young age, blue eyes. He is built short and stalky. His brother is VERY tall, lanky, dark skinned, long brown curly hair, dark eyes, face looks nothing like his. They are biological. I have known families who have two different races in the parents, and have several children that look like one of the single races. What I'm saying is, children don't always look like parents or siblings. Genes and DNA are complicated and there is decades and decades of people intermixing their DNA. Not everyone can always look alike, it's not possible!!