Entering an old account

Hi K&D and awesome staff🤗

According to the site My sister in law (being specific so that you don't think I'm trying to hack someones account)

Has an old account that she does not remember opening...

She does not remember username or anything...

So we can't renew password or make a new one

Can you please help?

I would put her email address here but

Having a husband that has studied cyber security

I have learned to be more (possibly too) cautious not of you all but of people out there...

Thank you💙💙💙