That's a quote from this article:
Doing things at the last minute doesn't tend to work. Respect and concern for Dr. Ford were the reasons that the allegations weren't mentioned sooner.
It doesn't seem as if there were political pressure on her at all to agree to having her information brought into the context of his earlier questioning. Nobody tried to use her to prevent his confirmation; when the media went after her, that was when the political people in whom she had confided made a decision about what to do.
It's not a smear campaign. It's not a tactic. Dr. Ford had no motive. If it were a conspiracy, the conspirators would have utilized her information months ago, to give as much time for her allegations to be heard as possible, and to give as much time as possible for other victims to speak out.
Also, no matter when the allegations were spoken, they would have been denied, the victims would have been called crazy liars, and the Democrats would be accused of organizing a smear campaign.