Yesterday I looked into Marshmallow's habitat and she was...acting strange. I alerted Benjamin to this fact and he checked on her, refreshed her water, and found some grubs to see if he could tempt her to eat. She seemed to perk up a bit and was hopping around for awhile. However, when we returned from our walk, we found Benjamin sobbing on the couch.
Marshmallow had died while we were out and Benjamin was, in Zoë's words, inconsolable.