"But in light of recent recalls," she said, "we have begun a systematic recheck of all products on our store shelves."
Lead paint has been linked to health problems, including brain damage, in children.
Earlier Monday, the New York Times reported that the toy retailer had hired engineers to regularly visit its stores to take branded toys to independent labs for testing.
Meanwhile, Walt Disneysaid it would begin random tests of toys, children's jewelry and infant products like baby bibs currently on store shelves within the next week or two.
"We're adding hopefully another level of assurance for parents when they buy a Disney product that it will be safe," Disney spokesman Gary Foster said. He added that the ultimate responsibility for the safety of the toys lies with licensees like Mattel .
Disney said it planned to inform Mattel and other toy companies of its intentions Monday.
The increased scrutiny comes after millions of toys made in China were recalled this summer, often due to excessive levels of lead paint.
Last week, Mattel said it would recall more than 800,000 toys globally that contained intolerably high levels of lead -- marking the third recall by the industry leader.