what happened to Tiramisu?

btw its the dog that libby(or nash or xander my memory is gone???) gets incase nobody remembers her name bc i sure as hell did not

she was introduced in the final gambit, right? right now im coming up on page 400 for the brother's hawthorne and have heard nothing abt that dog🤦‍♀️ i need to hear abt my favourite hawthorne ASAP.