What is Reddit's opinion of Lightahead® Artificial Mini Aquarium A Sensory Multi Colored LED Swimming Fish Tank with Bubbles?

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You can also look at interactive cat toys like treat balls, cat springs, chasing mice etc.

Try leaving the TV open for a few minutes or playing fish/bird videos on the laptop/tablet and see if the kitty responds to those.

If you have a suitable window, you can consider getting a cat window perch for the kitty to have a view of some outdoor action or move the cat tree near a window. One way to make this more interesting is to setup a bird feeder outside the window.

If aquarium is what you want, you can try out the artificial aquarium

https://www.amazon.com/dp/B00MXFIFJS

The cats I have "rescued" have went from me to a no kill shelter because I was taking care of them in the alley. My own cats are inside and have never been out since I've had them. The one I took into the rescue last was placed in the bathroom when I took him in (for isolation). The director had let me know that when they went to see him he was gone (from a closed room). He actually went up into the ceiling vent! Can you believe? I went to visit him after he was fixed and incorporated into one of the open cat rooms. I was able to pet him still while no one else was. I went to visit again after a while and he made some more progress. Last time I looked on their website he had been adopted.

The reason I tell you is because as painful as it is to hear the yowling you have actually saved her. Maybe try giving her a stuffed animal that you have slept with, something to cuddle with. She might have had other cats with her outside and be lonely for them. Also is there a window that she can see out of without climbing the walls or being able to open it? She doesn't need to be outside but cats do like to look outside. I also leave the TV on for my cats. I don't want your mother to be upset so maybe something like this would help. I think the kitty needs a distraction. Also I leave my radio on to music (classic rock like Journey, Queen - my preference). No one likes to be in a closed and quiet room all alone, but don't worry because that is why you are making it so nice for her. How is she when you are in the room? Also I saw someone recommended Feliway and I make sock babies for them. Take some old socks and tie them inside a tube sock (a longer sock) and tie a knot in the end. It is like a kitty body pillow. If you sleep with the socks in your bed first for a day or two then they will smell like you.

https://www.amazon.com/Lightahead-Artificial-Aquarium-Swimming-Bubbles/dp/B00MXFIFJS