Why do two dsl locations have different upload rates?

I was at my moms, doing some homework and i needed some stuff so i start d/l'ing some torrents. I noticed with µtorrent that she d/l's at like 600Kb/s while i barely get 300Kb/s. we both have DSL through AT&T.
I figured she might be paying more than me so i check the speed test at DSL reports and i show that she has higher latency than me and low d/l and u/l rates according to the flash test....
So what gives I have set up µtorrent properly there is no reason she should be getting better speeds than me.
By the way she runs Vista i run win 7 rtm, but i have the same speeds i have always had with my old computer w/ XP so i don't think its the OS

Ii know i have read that but we only live a few blocks away from each-other.