The Australian children’s book author Mem Fox has suggested she might never return to the US after she was detained and insulted by border control agents at Los Angeles airport.

Fox, who is famous worldwide for her bestselling books including Ten Little Fingers and Ten Little Toes and Possum Magic, was en route to a conference in Milwaukee earlier this month when she was stopped.

She told the Australian Broadcasting Corporation she was detained for one hour and 40 minutes and questioned by border agents for 15 minutes in front of a room full of people – an experience that left her feeling like she had been physically assaulted.

“I have never in my life been spoken to with such insolence, treated with such disdain, with so many insults and with so much gratuitous impoliteness,” Fox said.

“I felt like I had been physically assaulted which is why, when I got to my hotel room, I completely collapsed and sobbed like a baby, and I’m 70 years old.”

The author attributed the aggressive questioning to border police who had been “turbocharged” by Donald Trump’s proposed travel ban.

Fox said she was questioned over her visa, despite having travelled to America 116 times before without incident. She was eventually granted access to the country.

After lodging a complaint over her treatment with the Australian embassy in Washington and the US embassy in Canberra, Fox received an emailed apology from US officials.

Fox said she was shocked by her treatment and “couldn’t imagine” returning to the US.

Fox has written more than 30 children’s books, including the hits Where is the Green Sheep? and Time for Bed. Possum Magic has sold more than three million copies and is the bestselling picture book in Australian history.

This story was corrected on 27 February to clarify that Mem Fox was not questioned for two hours.