"I wasn't expecting to get a national title on the track today but it's pretty cool," said Petch.
"I am starting to get more used to the track bike and slowly starting to be more natural but there's still a lot of improvement to come."
On Sunday, Petch won all three of her motos at the BMX National Championships to claim her third elite crown and her 13th national title since taking up the sport at age 3, while Te Awamutu's Cole McOnie placed second in the elite men.
About 550 riders representing 27 clubs from Southland to Whangārei competed under strict red light Covid conditions, with BMX New Zealand and Hamilton club organisers splitting the weekend into four stand-alone events, with a full clean of the facility between half-day events.
Petch, building up for another European campaign, was untroubled in winning her three motos ahead of the under-23 winner, Hamilton club rider Baylee Luttrell, home from her base in Denmark.
"I handled it okay without the most ideal lead-up," said Petch.
"I just tried to stay calm, and race as hard as I could. I focused on keeping to my processes, get a good gate, hold my line and be nice and smooth around the track.
"I am used to 8m hills but it was good to get the variation. You had to think a lot more with the smaller jumps and not over-jump. It is nice to race on a different track.
"It means a lot to me to win the title and keep the winning record going. I will head to Europe in mid-May to get the world cup started and get the Olympic qualifying cycle under way from August."