That's a pretty disturbing story, and I never would have imagined they would not tell a victim. I understand the argument against it, but the risk of long term mental illness / PTSD from it being suppressed just seems way too high.
Take the door off. Use a knife to score the existing silicone and then pull the glass out. Use a razor blade and knife to clean up the existing silicone. Clean the surfaces well.
Get silicone bathroom caulk from home depot. Put some in the channel, put the glass back, put more along the seam. Use a wet finger to smooth it out.
Tape it in place while it cures and you're done.
I'm kinda surprised a piece with an attached door is just siliconed in place. Is there no retention screw or anything?
Maybe, but I wish it wouldn't be considered "really nice" and instead just be called basic compassion. Compassion doesn't seem to be common enough to be a basic thing though 😕
You can buy little usb powered heating pads, just stick it under a pillow or blanket that she'd like. They also sell cat beds with them built in.