krakhead
I hear what you are saying, but I use a completely different approach. When I get the idea things are headed South (she's yakking on about some other guy, being totally disrespectful) I say something like: "Whoa. I sense your interest in me is not nearly as high as mine is in you, am I right?"
This will catch her completely by surprise and force her hand, most likely embarrassing her lame ass. She'll stammer out something like "Yeah, uhh...I guess so" I reply with "Listen, I see you as attractive, intelligent, and caring...and that's how I always want to remember you, so let's end this call right now." (Do not say it harshly, just matter-of-fact, even soften your voice, then pause...ball is in HER court.) Her: "Well...yeah...okay...I guess." (She is now completely off-balance. You are complimenting her, yet YOU are headed out the door. What the hell is going on here, she wonders?)
"You're a wonderful lady, it's just not our time. I've enjoyed listening to you (because I found out a lot about you in two minutes, chick) I know I put you in a hard spot. Take care. Bye-bye."
Here is what you did (1) you made the covert (her hidden agenda)...overt (exposed her ass) (2) You maintained the direction of the call (3) You complimented her a couple of times in ways none of the losers she hangs out with talk to her (4) and YOU were the one to hang up. Trust me, she'll replay this conversation for days and don't be surprised when she calls back to apologize.
PS When she does call back, be friendly but a bit aloof. If she suggests it might be cool to get together, counter with "I understand, but my trust level is a bit low right now because you weren't straight with me the last time we talked." (This will rock her like a backhand and she'll do one of two things, either (1) she'll want to argue, to which you'll say, "Hey, I don't need someone raging at me right now. How about I accept your apology and we end this call. Thank you for calling me...really. It took a lot of courage, and I respect you for taking that risk. Bye-bye" , or (2) She'll apologize even more profusely and you have really gained the upper hand.
One more thing, when she leans in to kiss you after the date, say "I want you to mean this, okay?"
You've drawn real straight boundaries and she's now aware. Do you think you've just become a bigger challenge? You bet.