My coworker/veterinarian's cat of 22 years passed, was thinking of getting her something? Suggestions?

I work at a animal hospital but I am just a kennel technician (fancy word for basically just being a animal care attendant). Today she had to bring her cat in and put him down. I know she is very upset about it. I was thinking of getting her something small and putting it on her desk. I don't know what would be appropriate. I have read other websites stating to leave it alone unless she brings it up because work is where you want to forget, that doesn't apply here because we all know this cat and I know we will probably all sign a sympathy card for her but was still thinking of adding something small. Maybe a small card with a donation to the humane society in her cats name? If this is a bad idea, please let me know why. The hospital was closed today except for myself working in the boarding area so there were no technicians here, I was the one who helped her get things ready and say goodbye, so I myself am a little shaken up as well, technically still at work just taking a small break to write this up.

The last time he boarded was several weeks ago and she stood in here and chatted with me for several minutes worried he would pass while he was here and she was away and I took extra care of him, let him spend time with me at the computer, took picture updates to send to her and I know she really appreciated all of that. I also lost my dog of 16 years several months ago and still grieving so I know how hard this is for her. Could be overthinking things, so again, if you think I should just leave it alone, let me know.

Thanks to anyone who answers!