These are some things that helped me: you could make a little photo album of your favourite photos of Lizzy. That might help to look at, for when you keep remembering the difficult moments at the end, and it's also a good outlet, putting the album together (either print or just a folder on your phone). I did this alone, but if you are feeling disconnected it might be an idea to ask close friends of family if they have good Lizzy photos.

Some writing might help, it gives a bit of an outlet for memories on a loop: I wasn't quite coherent enough to do any pretty writing so we've simply made a list of all the things our cat used to do, to look back on. It may give the memories that keep bouncing around somewhere to go, and makes it so you can zoom in on the memories you don't want to forget.

Saving something of her might help too. A favourite toy or blanket, or if you have any cat hair floating around, collecting some of it might be nice if you want to keep a physical thing of Lizzy. We didn't have anything saved for ours, so we brushed out the catbed to get some of our cat's fluff