How can a girl be so strong?

My girlfriend is very strong. She works out but she is not over muscled she has some muscle. In the gym, she always lifts more weight than i can lift. When we wrestle with her, she usually
lifts me on her shoulders. (She squats to using me as weight, too.) When we wrestling, she lifted me her shoulder again. Then said "i wonder if i can overhead lift you" and lifted me over her head. How can it be possible? How can a girl be as strong as this?
I'm 72kg by the way.
How can a girl be so strong?
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