As prompted, mobile number provided for email security when signing in. Receive security confirmation email & then receive separate message advising that account is set to be removed.

When logging in to email account mobile number was provided for email security when signing in, as prompted. Security confirmation email is received displaying mobile number & request to confirm. Then receive a separate email message within a few seconds advising that the account is set to be removed.  This is my daughter's email account potentially affected, which is used for her work & school & she cannot be without her email account. The confirmation emails were sent to my (her Mother) email account. I am the overall account holder & we each have our own individual & separate email account. I am tempted to "click here" in confirmation email to cancel as if request not made by my daughter. Does anything happen with her email account if she chooses to "click here" & effectively cancel the activity? Please explain why her email would be scheduled to be removed & what do I do so neither her email nor my email account are removed &/or affected.

Many thanks for your help & assistance.