That’s definitely NOT a bedpan, it’s way too shallow. I’ve seen pewter bowls shaped like that for displaying fruit, but in my head canon it’s for Communion wafers.
Here’s a similar one: https://amusespot.com/products/wide-rimmed-bowl-by-match-pewter?variant=37212784522
Spaying her will settle her hormones, give her one less reason to try to get out, and will stop any neighborhood tomcats from trying to get in! It’s very much worth doing. Afterwards she may need to wear a onesie for a little while to keep her from licking her stitches, you know how raspy kitty tongues can be.