Ahahaha! Just... to get an idea of the noise Mae's seed makes, say wom in a low voice very slowly, and imagine a tesseract doing this:

https://www.youtube.com/watch?v=5xN4DxdiFrs

And when it moves, speeds up, gets excited, increase the pitch and speed of it's wom's. I don't blame mirra for being freaked out.

You also have to ask yourself how a woman raised in a medieval world who is illiterate,crazy, and deeply steeped in myth and legend even has the knowledge enough of a tesseract. Or did the seed just KNOW? What are the implications?! WHAT ARE THEY?!