Two Apple IDs

dnybae wrote:

Hello,

she has an older Apple ID with the Gmail address.

Is there a way to delete that older Apple ID so that she can use the Gmail address on her newer Apple ID? Or change the email on the old Apple ID to something else to free up the Gmail address to be used on her newer Apple ID?

No, the Gmail address has been used with Apple as an ID before. Although this next section discusses email address re-use in the context of deleting an account, it supports observations frequently posted on this forum about not being able to re-use an email address as an Apple ID once used previously as an Apple ID:

From: How to delete your Apple ID account - Apple Support

"Can I use the primary email address for my deleted Apple ID account to create a new Apple ID or with another existing Apple ID account?

No, once your Apple ID is deleted, you can't use the email address that you used with it to create a new Apple ID. In addition, you can't use that email address with another existing Apple ID except as a rescue [notification] email. Also, if your primary Apple ID email address is with a Custom Email Domain, it can never be reused to create an Apple ID after your Apple ID is deleted, even if the domain ownership changes."

If she does not want to use the Yahoo address she will need to come up with an email address that Apple has not seen before.

For that, you will need to have access to that other apple id. Try and recover the password for it at iforgot.apple.com

If you have access to it, you can try and change the email, but beware, it could be that you cannot change your current Apple ID into the email adress because it was an Apple ID not long ago, then you would have to wait a while