Omg I'm so sorry for your loss. That's a terrible situation to find yourself in. Also my worst nightmare as I have a husky x a pug and a long haired cat of some kind as well as my 2 gliders. I think you ought to look in on another cage mate as I don't think that mistake will happen again. But it's really up to you. They are alot of maintanance but at the same time so freakin adorable. Do lots of research from previous posts on this or other forums. Youtube videos can be helpful if the maker is well informed. There's lots of contradictory stuff our there so I play it safe as far as foods and balanced nutrition.
Good luck and once again so sorry for your loss!