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Have her go to the Citi prequal page and see if they offer anything.... If they do, then that is stronger than an invitation IMO.
I got an email from Citi - "Ends soon! You're invited to apply: Earn ThankYou Points to redeem for travel rewards & more with theCiti ThankYou Preferred Card".
But when I went to their pre-qual page, there was no offer.
When I clicked the apply link on the email, the address started like this:
https://www.citicards.com/cards/acq/Apply.do?app=UNSOL&.................................&cmp=...................~CARDSACQ~LEADGENOFFER...........................
which most likely means it was just an "unsolicited" - lead generation offer. If that is the case, for someone who is reviewing the application it might not even show up that I apply from an email invite.
Not very sure about this. But if it is a serious one, it should either be available in the pre-qual section or be sent via snail mail.