"I could not have got this far without their ongoing support and I will pay them back big time one day," said the singer.
Whanganui mentor Lyn Shackleton guided her singing while she attended Whanganui Girls College and later Wanganui Collegiate.
"I went to Hamilton to attend Hillcrest High School for my final year and I have had wonderful training with Jane Tankersley and Ian Campbell.
"My current teacher Glenese Blake has developed and supported my voice so much during the past year."
Ms Karl said New Zealand tenor Simon O'Neill is an opera singer she greatly admires and she first met him in Whanganui during Opera Week.
"I don't have a classification for my voice yet and I won't know which category I fit in to until I'm about 26."
On her parents' Durie Hill balcony, she seems to have no trouble singing Die Mainacht by Brahms for the Chronicle in high key F#.
She has plans to attend some 2018 Whanganui Opera Week events and said she will probably have another turn at busking during next week's River Traders Market as well.