Hi C. - I'm not sure how to help you with your question, but I want to commend you on teaching your daughter the correct words for body parts! So many parents don't and I jusat think it's silly - why not teach them correctly from the beginning...? It lays the groundwork and sets the precedence for those difficult conversations in the future.
After a while, we have fun and silly names, but the foundation is so important.
So along that line, I am hoping you will appreciate that the part of the body you are referring to is actually called the vulva. The vagina is inside... (A very common error, but one of my pet peeves!)
Enjoy your day - and your daughter.