She may be infertile, but that's not gonna stop her from having fun.
On the contrary. She'll have even more fun because of it.

And yeah. I gave her a horn. Her nidoran form has a horn. And nidoqueen also. So it makes no sense why nidorina doesn't have it.
In fact. I could go on for a while about how little sense she makes genetical and evolutionary . I was going to change more than just her horn, but people were kinda meh. :I

This character was suggested by PK Starstorm on Discord.