Since the communication has continued you will not need to make a choice as to how much more you feel it is acceptable for the communication to keep going.
Personally, I think it may be time to confront her IF you are ready . By ready I mean...are you will to lose her (which in some case you already have) when you confront.
Starsky is probably the best I know to provide the step by step on how you need to confront in a loving way.
Before you confront I suggest that you be very clear on what your boundaries are, how they will be enforced and what the consequence is if they are not adhered to.
Good luck man.
Eric
"The difficulties of Life are intended to make us BETTER,not bitter". "Fear is a prison, where you are the jailer. FREE YOURSELF!" "Life is usually all about how you handle Plan B." - Jack3Beans