Grandma taught my daughter word "coohie" when wiping her vagina after going pee

So im hispanic and raised talking Spanish. I'm fluent in enghlish can read, write, read... however, there are still new words I'm learning or have never heard before. I was raised Catholic and in a religious family. I had heard the word "cookie" but not coohie? Is it slang for vagina or is it a bad word? I'm not sure if I should be upset she taught her that, or is it proper for vagina? When my daughter started talking, I called it "V" and later will teach her full word vagina. I wanted her to know proper names for her body parts. I did get upset and feel it was inappropriate, or am I wrong? Need some advice as I not sure this is okay or not okay?? I am feeling uneasy because if it's wrong what do I tell her to correct it and should I draw a boundary with mother in law or just let it be and just teach daughter that is not appropriate and would like her to call it just V? Any advice would be so helpful