The immediate playing future of former Australian Open champion Angelique Kerber is in doubt, with the German retiring from her second round match at the Adelaide International with a back injury.
Barty said she was aware of Collins' "exceptional" ball-striking abilities as she continued to build up to the Australian Open, where she will be the first female top seed from the host country since 1977.
Kerber, who also made the semi finals at Melbourne Park in 2018, dropped the first set to Dayana Yastremska 6-3 and was trailing 2-0 in the second set when she called the trainer for treatment on her lower back, before conceding the match.
"It's getting better and better", Barty replied when asked to assess her performance.
Simona Halep of Romania reacts after a point against Aryna Sabalenka of Belarus during their women's singles quarter-final match at the Adelaide International tennis tournament in Adelaide on January 16, 2020.
"It feels great, we had a tough match and she played well", Sabalenka said. "I don't care about the Grand Slam, I'm just playing each match".
Croat Donna Vekic rallied past Maria Sakkari of Greece 2-6, 7-5, 6-1, winning in two hours and overcoming six aces to reach a quarter-final against Yastremska.
"It's nice to be in the semi-finals just in the beginning of the year", she said. "That's all I can think about".
In men's play, Canadian second seed Felix Auger-Aliassime swept the last 10 games to crush Australian wild card Alex Bolt 6-3, 6-0 in 54 minutes, losing just four points on serve during the rout.
"This is as good as it gets for sure", the 19-year-old said.
The most impressive win of the day belonged to Marketa Vondrousova, however, as last year's French Open runner-up claimed a stunning 6-0 6-0 victory over home hope Arina Rodionova, setting up a meeting with another Aussie in the quarters - world number one Ash Barty.
"If I can bring my "A" game, I believe in my chances".
Elise Mertens remains on course for a third Hobart International title after the top seed dropped single game in her 6-1 6-0 defeat of Viktoria Kuzmova, setting up a quarter-final with Great Britain's Heather Watson, a 7-6 (7-5) 6-3 victor against Fiona Ferro.
Fourth seed Pablo Carreno Busta started with a 6-3, 6-2 defeat of Frenchman Jeremy Chardy.
The qualifier, who lost just seven points on serve, will face Tommy Paul of the United States, who beat Spain's Albert Ramos-Vinolas 6-3, 6-4.