How to cancel yousician subscription on daughters managed account

Got an email from apple about a subscription renewal for yousician guitar lessons that I gifted my daughter with a iTunes gift card last year. I’d like to cancel the subscription but when I click on the link in the email it won’t load a page. I have gone on the app Store to see if I can find the subscription and it’s not showing up on my account or her account that I manage. I’d like to be able to cancel it before apple charges me for another year on my credit card for 149$. I have till the end of the month to figure this out thanks.