Never understood why the Espheni Queen was upset?
So, she commanded her daughter and army to try to take over Earth, and she gets upset that she lost her daughter because the primitive humans defended themselves?
I get that she was upset at losing her daughter, but the Queen has only herself to blame for provoking the humans on Earth when they were just minding their own business. I've never understood blaming others for something you caused in the first place.
Not to mention, the humans of today don't even compare to the ones 1500 years ago. So, she was getting "revenge" on the wrong humans anyhow.