This is what you think it is, a codependent person latching on to you in the same way alcoholics do. Look at her as an alcoholic, apply the same rules of engagement, and you'll make the right decisions.
God bless her, but she's got a way to go in Alanon if she is manifesting her codependency upon you, or anybody else in Alanon, this strongly.
Take care,
Cyranoak