90s Godzilla movies were weird. Int he same movie, they were able to sense Biolantte's emotions with a Japanese psychic. It's how they knew roughly what her motivations where.
She, the psychic, was a staple of 90s Godzilla movies. She ran an institution for training other psychics so they could track/attempt to communicate with Godzilla.
ALSO from this movie, When Biolante dies, some of her G-Cells (Godzilla cells) go into space, get sucked into a black hole, those G-Cells combine with space crystals, and they form Space Godzilla.