My girlfriend sent me Bitcoin she received email I got nothing no email no money and no help from Coinbase, they said person who got $700 received and spent it...
Based on what i understand with very less detail.
So your girlfriend sent out some Bitcoin and yes, coinbase do really give out email notification neither you do sent nor receive up coins into your wallet.
The question is, did she sent out on the right address? because if those coins didnt arrived into your own wallet then she probably sent out on other wallet address
on where coinbase cant do anything once its been sent out yet transactions are irreversible.