The 22-year-old trimmed 4sec off her fastest time for the individual pursuit in a training event in Cambridge last week.
She cracked the 3min 40sec barrier to record a time of 3min 39sec. It is wonderful timing with the national track championships getting under way in Invercargill today.
Keith has also recently been named in a 12-strong New Zealand team for a world cup event in Colombia later this month.
In the post-Olympic year, Cycling New Zealand is keen to provide opportunities for its developing riders to shine.
Keith, who finished third in the scratch race at the Melbourne Oceania Track Championships last year and also helped the pursuit team secure a silver medal, is keen to build on her recent good form.
She is contesting the individual pursuit and 500m time trial at the nationals today. She will compete in the points race tomorrow and on Saturday she will attempt to qualify for the finals of the scratch race later that evening.
On Sunday, she will turn her attention to the women's Madison in which she will team up with Auckland's Nina Wollaston.
Keith made the move to Cambridge where the New Zealand team is based about three years ago. But she was born in Dunedin and has chosen to continue to ride for Otago.
She has set her heart on lowering her best time in the pursuit again and should also feature strongly in the scratch race.
''That's the one that means the most,'' Keith said of the pursuit when asked what her strongest event was.
''Last week, I actually broke my personal-best time by 4sec. I finally broke the 3min 40sec mark and I just want to do that again.''
Keith picked up the sport while attending Taieri College and looked up to former world champion and 2010 Commonwealth Games gold medallist Alison Palmer (nee Shanks)
''She was always helpful. When we had the nationals down here [Invercargill] a couple of years ago she came down and gave us a hand which was quite cool.''
Meanwhile, the Southern Performance Hub, to be based in Invercargill, will be officially launched this week.
Coach Sid Cumming has named the initial seven riders to join the hub.
Five riders from Invercargill - Maddy Gough, Tayla Lumsden, Mitchell Morris, Sam Miller and Corbin Strong - will be joined by Alexandra's Nicole Shields and Dunedin's Ewan Syme.
