You are doing the right thing and congrats on 16 days.
Just give her back her stuff, someone wanting the Big Book back is a first though
and block her number. If you have an android, Mr Number is a free app which will send her calls straight to voice mail or hang up and will hide the texts.
Right now, keep going to meeting and observe.
You want someone who has what you want. Talk is cheap, look at how someone is living.
Don't feel guilty about dumping her, that was the right decision.