(CNN) The mother of a Tennessee toddler missing for two months was arrested on Tuesday after giving investigators false information, police said.

"During the investigation we determined that some of the statements Megan Boswell provided to us were false," Sullivan County Sheriff Jeff Cassidy said Wednesday. "Many of the false statements that Megan made delayed our investigation and also impeded our investigation on trying to find Evelyn."

Boswell has been charged with one count of false reports, he said.

Her daughter, 15-month-old Evelyn Boswell, was last seen two months ago and was reported missing last week by her grandfather.

"Every time we talk to her, her story changes. I'm serious when I say that," Cassidy said. "Every single time."

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