I can completely relate you both of you, GreekCutie and Hootie...my big sis wasn't really there for me either while I was a pledge. I did get my first choice and thought that it would be so great to have that bond with her as my big sis, but unfortunately it didn't work out that way. I think that we only went out one time and did something together
In fact, she went inactive right after I activated. But, like Hootie, I too found other sisters that sort-of unoficially "adopted" me as their little. I agree that this should be brought up (in a nice way) to the chapter because having a big sis that you can count on and have a bond with is an important part of pledging, I think, and it's unfair to those who don't get to experience that.