Steve,
As Becky stated, if you felt anything hard at all, it is either a follicle or a slug. Eggs should feel very squishy, and you really have to concentrate to feel the seperation between eggs. My guess would still be that she will ovulate in the next 2-4 weeks (however, I have had females hold large, 26-35mm follicles, for up to 3 months before ovulating).

Hope that helps,