Labor support for embattled backbencher Emma Husar appears to be evaporating, plunging her political future deeper into doubt.

Ms Husar has been forced to weather a series of damaging headlines since it was revealed she was being investigated over allegations of workplace bullying.

Since that story broke, there has been a stream of negative stories, prompting colleagues to predict Ms Husar will not recontest the next election in her marginal Western Sydney seat of Lindsay.

Senior Labor figures have told the ABC that whether or not the allegations against her are proven, the perception and "pile-on" will make it very difficult for the first-term MP to survive.

One Labor MP said politicians could survive a few days of negative press but said that in Ms Husar's case, it was seemingly endless.

The latest claims about her use of taxpayer-funded entitlements have prompted the first-term MP to ask the Parliamentary Expenses Authority to review her spending.

It has been revealed Ms Husar skipped the second day of an NDIS committee hearing in northern Queensland to travel to Brisbane to attend a Bruno Mars concert on March 14.

According to publicly available travel records, Ms Husar spent $114 on "car costs" in Brisbane that same day, but it is unclear at this stage whether she claimed travel allowance.

Ms Husar maintains "no work expenses were used to attend a concert" but said she had asked the Independent Parliamentary Expenses Authority [IPEA] to "double-check".

"I take the use of taxpayers' money extremely seriously," she said on Twitter.

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Ms Husar said the concert tickets were a birthday present and that she had two meetings lined up in Brisbane for the following day, "with two organisations to discuss domestic violence policy issues".

Negative press 'seemingly endless'

Several MPs have told the ABC it is very unusual for a politician to travel for committee work and not attend the full schedule of hearings.

Ms Husar took personal leave last month after it was revealed she was under investigation by the New South Wales Labor branch, over claims she bullied and verbally abused several of her former staff.

Buzzfeed News first reported the allegations, suggesting Ms Husar had been responsible for harassment and intimidation and had demanded staff carry out personal duties.

Last week, Channel Seven revealed footage of one of Ms Husar's staff members walking her dog and picking up after it.

The Australian newspaper revealed she had been accused of using parliamentary entitlements to buy household groceries, including toilet paper.

Ms Husar has previously said the bullying and harassment allegations "do not reflect who I am of how my office operates".