(CNN) - Ann Romney said in an interview this week that she has no reservations about her husband's ability to serve as president.
But she does have a small concern about the GOP presidential nominee assuming the top office.
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"I think my biggest concern obviously would just be for his mental well-being," Romney said in an interview with Reno, Nevada, CNN affiliate KTVN.
"I have all the confidence in the world in his ability, in his decisiveness, in his leadership skills, in his understanding of the economy, in his understanding of what is missing right now in the economy, the pieces that are missing to get this jump-started," Romney said. "So for me, I think it would just be the emotional part of it."
But Romney's reservation about her husband, Mitt Romney, did not hold her back from encouraging her husband to run for the presidency.
On the campaign trail, both Ann and Mitt Romney often tell a story of how she encouraged her husband to throw his hat in the ring for a second time after his unsuccessful 2008 bid for the Republican nomination.
"I got a camera out and I videotaped myself," she said at an event last month. "I made this videotape and I said I am never doing that again."
"I gave it to Mitt and he looked at it and he said, oh - you know, you say that after every pregnancy," she continued, to laughs.
But the "legacy of debt" the country would leave to her children and grandchildren's generations, she said, was enough for her to encourage Mitt Romney to enter the race again.
And it was enough to encourage her to muscle through the vitriol of a campaign, which she said is "always part of the package."
"It is not easy on the wives, the children, the family and the friends because you see someone that you loved, being maligned, lied about, mistreated, abused, criticized," she said. "And by the way, every person that you know is always giving them advice on what they should do and say."
When her husband is wound up, she can have “a very calming influence on him,” Ann Romney told CNN Chief Political Analyst Gloria Borger in an interview this summer.
But overall, her husband is calm and confident, she said.
"I think where it goes to is this internal sense of self, where he's very confident in who he is," she in an interview with CNN’s Piers Morgan. "But he also knows that as president, he's going to be doing things that may not always be understood, but they're going to be always the right thing, what he believes is the right thing for the country."
- CNN's Gregory Wallace contributed to this report