An Aussie woman says she is constantly worried about being barred from other countries after she was deported from the US for a trivial reason.

Madolline Gourley recently applied for a working holiday visa to Canada and had a shocking 2022 experience in the back of her mind.

Three years ago the Brisbane local flew into Los Angeles for a pet-sitting holiday, but was denied entry because she was in violation of her ESTA visa waiver.

It was because the free use of an owner's home was considered a form of payment and anyone with an ESTA visa waiver is not allowed to work.

She spent 75 days in the US in early 2022, which Ms Gourley sensed the officer was looking at as he questioned her.