transfer secondary email address to another account

Thank you.  I was able to link the account.  So, if my mom cancels her account, I can still access my email?

I can't tell what account I'm logged into since it is the same credentials.

You’re welcome @user_c5of8a! To avoid losing access to the email, please log in to the email using the Xfinity Connect Site 90 days prior to the account being disconnected. Once the account is disconnected we will want to sign in to the email through the Connect site every 9 months.

Towards the bottom of the guide above, there are steps on how to switch between linked accounts.