She and Dr Sharples might rejoin negotiations at a later stage.
United Future leader Peter Dunne and lone Act candidate John Banks completed meetings with Mr Key earlier this afternoon.
When questioned on whether he could get a ministerial post in the National Government, Mr Banks joked that the finance minister position sounded "pretty good".
His call was met by laughter from Mr Key.
Mr Banks said limiting the role of Government in business and cutting expenditure were Act priorities.
Mr Dunne was first to sit down with Mr Key.
Heading into the meeting, he was tightlipped about what he hoped to get out of it.
"We'll have a good chat and I guess things will just take their course from there. I'm going to talk about the election I guess," he says.
Following the meeting, he did not give details about the agreement he's seeking, but said he would be seeking policy gains.
Mr Key said the sit downs are an opportunity to put issues on the table.
"To explore areas of interest where we've worked in the past and might go in the future, where we have common interest and start negotiations for what will hopefully be a completed deal."