How to deal with a coworker who always asks tons of questions?

I work in HR, my first job out of college in my field. An employee calls/emails/stops by all the time to ask about internal job postings. She asks every single question imaginable. I'm very nice to her and answer her as best as I can, but sometimes she takes up a lot of my time. My primary job is not employee relations OR job postings...I do post jobs, but it's a small fraction of what I do. How can I best deal with a needy person like this? I was told she is a very needy person.