"Am I doing the right thing by completely ignoring her?"
May I ask why you ask? Can you look within yourself and identify the feelins you might have that bring about this question? For instance, when I recently had involved myself with a crack-addicted alcoholic, I did so in part because I felt responsible for him. Is there something you feel that makes you think that ignoring her is wrong?
"Is there some middle ground, where I don't feel like I'm completely abandoning her?"
Is there a middle ground in your sobriety? Some point where a little is enough? There is no such point for me personally. Not with alcohol and not with alcoholics or addicts. Except my Dad. But never with a partner. Most of the time here on F&F we recommend 100% No Contact.