Is your ex using her fb ?
if not, you could change the name of her fb to yours and continue with that.

Or else, I don't think there can be a "transfer" from one fb account to another.

if you have good relations and still have access in her account (doing you a favor), one thing you could do is to send TE invitation to your new fb account, then start playing (and being TE friends with your old team) and your old team could send as gifts to your new team , what gear you had (emblems, jerseys).

At the moment, don't start a new team with the new account.