Seline Ayala, 23, has been arrested for carrying $2 million worth of liquid meth

A woman has been arrested for carrying $2 million worth of liquid meth in jugs labelled 'Purple Power'.

Seline Ayala, 23, was driving in Austin, Texas, when a K-9 dog sniffed out 75 pounds of liquid crystal methamphetamine.

Police officers had stopped her for speeding but then proceeded to search her car because she changed her story several times about who she was and where she was going.

She became 'verbally aggressive' when the officers questioned her before they found the drugs in her trunk.

Ayala had been driving in a 2013 Dodge Avenger with her four-year-old daughter and her babysitter on July 12 at about 11pm when police stopped her.

She told the officers she was a doctor and was headed to Dallas for a meeting, police say, although that story changed as police asked for details about who she was meeting and the name of her employer.

A K-9 dog sniffed out 75 pounds of liquid crystal methamphetamine found in three large jugs labelled Purple Power (pictured)

Ayala then refused to let police officers search her car. They brought in their K-9 dog who sniffed out the drugs which were in three large jugs which once contained cleaning products.

She later told investigators she was delivering the drugs for a second time for an unidentified man. Her text messages supported her story, police say.

The first time this unidentified liaison had arranged for her to send the drugs to Carrollton, about a half hour drive from Dallas.

The young mother has been charged with drug trafficking and is currently being held without bond before her pre-trial detention hearing.

Because she was carrying drugs that weighed significantly more than 300g, she could face up to life in prison, according to Texas law.