Would you think "cutting her off" get her attention?

we've been dating for 4 months. the honey moon phase was over in about 2 weeks the first month of dating, and that's when things got really interesting! In a nut shell, she and I have been having issues communicating and understanding eachother. She often times misunderstands me and aswell as I misunderstand her. But we'd make sure to sit down and talk about it and usually after that I'd feel much better, and we'll be back to our loving selves......well she finally met my mother a few months ago and things seemed to go pretty well, until last month my lady friend calls my mother to see how she was doing. my mother and she talked, hten my mother asks something really really personal, which offended my lady friend. I was adv of the convo between the two of them and I too was offended that my mother would ask such a thing. I confronted my mother about this. My mother understood her wrong and was ashamed and called my lady friend to ask for forgiveness and apologize. "there it's finished" is what I thought. But since that incident my lady friend keeps bringing this issue up. and whenever she and I have a disagreement she would reference back to my mother. She and I had another sit down last friday. We talked about everything, from how we felt to what we've learned about eachother, to what we didnt like and etc.....I also went on to let her know that she is too serious and that i wish she would lighten up and live a little. I mentinoed how i don't think that she and I are compatible and how we dont have anything in common except we both want to be loved, respected and appreciated and that we both want to be married and have children one day. But from what I understood of this convo, this was something that we were willing to work on. We agreed to tone things down also, because we both felt that things were moving a bit fast....after that we kissed, and I walked her to her truck...... the next night we were out to see a movie..... she was distant. I showed up to her place a couple mins late bc i had to grab tickets to beat the crowd and she immediately tells me "we can see the movie some other time"....what? anyway i show up at her place. we go to the movie. and she was rather distant the entire time. as if her mind was else where or that she didnt want to be there. when i dropped her off at home, there was no conversation, but i just took that as she was tired because she was sleep during part of the movie aswell as during the ride home. the next day was no better. normally i would get a text in the morning wishing me a good morning and etc.....but i got nothing. we didnt talk at all until i sent her a "thinking of you" text around 6pm. her response was "thank you. have a nice day".???? anyway it's been going at this for a while. she hasnt told me she loved me in over a week now. I have asked her time and time again what's wrong and if she is ok. she would tell me that she is fine and that nothing is wrong with her.....but i could clearly tell. she's distant, doesnt call any more, doesnt text any more, seems as if she isnt concerned about me at all anymore. but ya the entire relationship i have shown her love. I have tried being there for her in everyway possible. this woman told me back in march that "she loves me and wants to spend the rest of her life with me. she has never felt this way before".... you know? and now this??? anyway, I talked to my cousin who advised me that my lady friend is being an a$$ and what i need to do is just fall back. cut her off completely. She told me that she is used to me always being there, being what a man is suppose to be to a woman and that my lady friend "knows" that i'll be there regardless. So what i need to do is flip the script and fall off. and one of two things may happen.... my lady friend will realize that I'm no longer around and will miss me and contact me..... or ..... she will not care....which will just convey that she never cared all along. sorry that this is long but i had to vent.