That clause after "seem"

Hello
Please, will you be so kind and hlep me with this sentence?
It seems, that whether you are my friend, she is just a girl next door.
It doesn´t make much sense, but I just wanted to know the function of the "that clause" here. Am I right, that this is a nominal clause, functioning as a subject complement (nominal predicate), or is it a direct object of seem? "Seem" is a copular word, isn´t it? So it shouldn´t have a direct object, right?
Thank you so much for your replies, Kate