Allegedly Disgruntled Babysitter Charged With Arson

Martha Dreher, 57, was arrested after allegedly setting a family's home on fire.
1:58 | 08/23/14

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Transcript for Allegedly Disgruntled Babysitter Charged With Arson
First the baby-sitter accused of shocking behavior. She's now under arrest in Texas. Authorities calling her an arsonist claiming she set fire to the very home where she was employed. Apparently upset over the way she was being treated and ABC's Ryan Owens has more. Reporter: Police say this baby-sitter got so annoyed with the preteen girl she had been caring for she set their bedrooms on fire. 57-year-old Martha Drayer is charged with arson. Glen Williams says she targeted his daughter. Definitely a vendetta against the two girls. Reporter: The girls were out of town with their dad so no one was hurt. She worked for the family for a couple of months and denies setting the fire but tells investigators she was tired of dealing with the girls and wanted to quit. She said that it was horrible, that the girls -- my oldest had been very disrespectf disrespectful. Reporter: Detectives say these cameras caught her driving up to the empty house in Austin, Texas, then leaving 20 minutes later. With flames visible from the girls' bedroom windows. Hours later, the girls' older brother came home. My son Adam came in and said, dad, I just went to the kitchen. There's a lot of smoke. Reporter: She has pleaded not guilty and her attorney said she had no reason to lash out at those girls. The thing that we are going to be pushing for in addition to obviously lie detector tests and everything else that we can do to prove her innocence is evidence. Reporter: Meanwhile, Glenn Williams is gutting his historic 90-year-old home but repairing that is easy compared to explaining to his daughters that their baby-sitter is now an accused arsonist. For "Good morning America," Ryan Owens, ABC news, Los Angeles. Domestic situation going very, very wrong. And the one thing you always look from your caretaker or nanny, trustworthyness. A lot of other news.

This transcript has been automatically generated and may not be 100% accurate.

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