That's too cold for my liking personally. 84 during the day is a bit on the colder end and a complete ambiant of mid-70's at night when the hotspot turns off is just way too cold in general without a hot spot imo. It also looks like she died before even swallowing it or was in the process of regurging it and somwthing went wrong. Could just be a random freak accident or something more but there's nothing that can be done now. Personally i would raise temps if i were you and keep the hotspot on 24/7.