"We were told he was not going to make a comeback, now here he is, turning up all over the place," she added.
Nick Clegg's handling of the affair has been repeatedly called into question. An initial response from the party suggested that he was not aware of the allegations but the party leader later admitted he had known of general concerns.
He conceded on Wednesday that his party made "very serious mistakes" in failing to deal properly with complaints made about the peer.
Pressed on whether the issue played any part in Lord Rennard's departure as chief executive in 2009, the Deputy Prime Minister told LBC 97.3: "Like any new leader of any organisation or political party, I wanted to make sure that the organisation reflected my priorities, my values. I felt it was time for a change at the top of the professional party. His health was poor and that was the immediate reason he left but of course these things were in the background."
Lord Rennard, who stepped down as chief executive on health grounds, has said he is ready to "co-operate with any properly-constituted inquiry" into allegations of inappropriate behaviour. The peer has issued a series of strenuous denials of any wrongdoing.