Trapped on Predator Planet by Vicky L. Holt

If you love a predator, you'll always be his prey
Joan Wu, 46-year old exobotanist and miner for IGMC, woke up to VELMA's long list of bad news up to and including death by bog, death by air, or death by a corrupt alien queen. While the bad news was dizzying, the worst part was that for a few blissful seconds, she'd forgotten her husband's death and thought he was sleeping right next to her. She was trapped in the deadly Agothe-Fatheza, famous for its insatiable appetite, with no one for company except the artificial intelligence and a dinosaur she named Eunice, all while experiencing the grief of her widowhood, even after two long years. As her depression worsens, her will to live starts to shrivel up ... until she hears Raxkarax's voice for the first time. He's coming for her, and she can't decide if she should be relieved-or terrified. Because she's learning that while Predator Planet might be populated with ferocious beasts, sometimes the most terrifying creature in the galaxy is love.
Raxkarax is no stranger to peril. A seasoned veteran of Certain Death, he knew the moment he heard there was a pod in the nightmarish Agothe-Fatheza that its occupant was his heart mate. With no hesitation and no fear, he set out on his quest to reach her before the Night Corruption consumed her body and soul, but he wasn't prepared for the biggest threat he'd ever face: losing her love. Just like the sacred hunting grounds, Joan's heart was best approached with caution, a healthy dose of patience, and abject awe at the unexpected beauty he found there.
As the entire planet threatens to heave its survivors off its very surface, and multiple threats combine to destroy the entire band of aliens and humans for good, Joan and Raxkarax find a precious and tender love between them that they must nurture and protect if they want to survive Certain Death with their hearts intact.
This is the fourth book in the Predator Planet series. While each book contains its own unique romance for a different couple, the series is best read in order to appreciate the scope of the larger plot. This book contains mature themes such as profane language, spousal death and infant loss, monster violence, unaliving ideation, chronic depression, and an awkwardly graphic consensual scene that fumbles around in the dark.