What does it mean when a girl calls you "mate"?

I was having a convo with the girl I like about waking up early. and we starting joking about it... in reply she said

lol :D 8am guy now waking up at 5.30 is really an achievement!

good going mate :P

Is this a bad sign? Or was she just joking it or didn't really mean like that?
What does it mean when a girl calls you "mate"?
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