Annoyed, what should i do?

This is kind of two questions in one. I got engaged to my boyfriend of 3 years about 7 months ago. I wore my ring to work and when co- workers asked if I were engaged I confirmed. Ever since then there has been one co-worker in particular who constantly asks me about my wedding, i've told her on more than one occasion that it will be a very small ceremony considering that our funds will not allow us to have a big elaborate wedding. She still continues to ask and ask about whats going on, i am annoyed how can i politely tell her to stop with the questions. Asking me about my wedding is okay but shr constantly ask the same questions!