Calling a guy "mate," "dude," "friend," "buddy,"......these can all be signs that she just wants to be friends. See if she does this with everyone, or just with you. If she calls everyone "mate," it might just be a habit. If she's only doing this you, she's letting you know you are just that - a friend. :(
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When a girl calls you "buddy," it usually suggests that she sees you more as a friend or someone she is comfortable with in a platonic way rather than a romantic or intimate partner. It's a casual term used to show camarader or friendliness without any romantic connotations.
She is calling you her friend... unless she calls her father that as well which cud mean you remind her of her dad.