Speaking in the Channel 4 News debate in Wolverhampton, she said Theresa May was a better choice and she was concerned about Mr Corbyn getting the top job.
Presenter Krishnan Guru-Murthy asked her: “Do you worry about the prospect of Corbyn in charge?”
The audience guest replied: “I do worry about Jeremy Corbyn, I think if he ever becomes our prime minister, we might just as well throw the towel in.”
Another guest was not as positive about Mrs May but said she was the only leader who could successfully navigate Brexit.
An audience member said she did not think Jeremy Corbyn was up to the job of prime minister
If he ever becomes our prime minister, we might just as well throw the towel in
He said: “Theresa May isn’t a great leader, but we don’t have any great leaders at the moment.
“But to come out of the EU, it’s only Theresa May that’s going to take us out of the EU, which is what Britain voted for.
“Who else is going to take us out?
“I don’t think Jeremy Corbyn. He doesn’t really have the dynamism to be able to get a deal with 27 other leaders of the EU to be able to do it.”
Things you didn't know about Jeremy Corbyn Thu, March 17, 2016
Random facts you didn't know about Labour leader Jeremy Corbyn.
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Things you didn't know about Labour leader Jeremy Corbyn
Over the weekend the German Chancellor, 62, sparked outrage after she insinuated the European Union could no longer rely on the UK or the USA.
But at a speech in the West Midlands today, Mrs May lashed out – reminding the German leader the two states still need to work together for increased security.