I had a female mutant chimby in my hatch slots and was trying to come up with a name for her, but this morning she turned up missing. I checked in the graveyard in case she had died, but she wasn't there. I had had her for a little while but hadn't been able to name her so she'd remained in my hatch slot. What happened, and what can I do about it?

If it's been over 15 days then she ran away. Sorry, nothing you can do, it does say that they will run after 15 days of not being named in the deion of the hatch slots.