Try Again

My co-worker is clingy. We were on a teambuilding group together. Our group went to lunch once after the team builder. She invited me (alone) to try a new restaurant and I gladly joined her. We had "water cooler chat". She then incessantly sought my approval on EVERYTHING. She began asking odd q's about my boyfriend and finances. She said stereo/racist things and I called her on them. She couldn't understand why I was offended b/c I'm not those races & I repeated my sentiment. I avoided her like the plague. This worked for a few weeks, but then she started having me paged at work so I would have to return to my office and pick up the phone. Yesterday, she sent another co-worker to ask if I had lunch plans. I said I'd be willing to go for lunch. When I showed up at the meeting place, the clingy co-worker was there instead. It was a "suprise" because cling-o-matic thought we needed to catch up. What am I supposed to do? I say no or cancel to everything. HELP.