Kubainski moved to Western Australia after securing a national cadetship with the ABC in 2005. Kubainski graduated from the Queensland University of Technology with a Bachelor of Laws and a Masters in Journalism.^[1]

In 2007, Kubainski won the Best Newcomer Prize at the WA Media Awards. Kubainski joined Channel 7 Perth in October 2007 as a reporter and began presenting Seven News Perth weekend news in June 2008 as well as being the court reporter.^{[citation needed]}

In October 2009, Kubainski filled in as a news presenter on Sunrise while Natalie Barr was co-hosting as Melissa Doyle was on holidays.^[2]

In December 2010, Kubainski filled in for Ann Sanders on Seven Morning News, presented news updates on The Morning Show and Seven Late News Updates. She has also presented Today Tonight in Sydney.

In October 2012, Kubainski moved back to her hometown of Brisbane. She finished as weekend presenter of Seven News in January 2013 with Blake Johnson and Samantha Jolly announced as her replacements in a sharing capacity. Kubainski joined Seven News Brisbane as a reporter.

In February 2015, Kubainski moved back to Perth and joined the Nine Network.^[3] She replaced Libby Stone (who returned to Nine News Queensland) as a co-anchor on Nine News with Tim McMillan from April.^[4] In her first year, Nine News' national ratings were the strongest it had been for over a decade,^[5] but in subsequent years the ratings deteriorated^[6] and in December 2017, the Nine Network announced that Kubainski's and McMillan's contracts would not be renewed.^[7]

Kubainski is of both Filipino and German heritage^[8] but was born in Queensland and moved to Perth after she secured a national cadetship with the ABC in 2005 with then-boyfriend lawyer Tom Fotheringham. Kubainski and Fotheringham met while studying at Queensland University of Technology and married in 2009 at Margaret River.^{[citation needed]}

Kubainski has two children.^{[citation needed]}