hi,
have you read the latest BW (Solves all your problems) book? it has tons of detailed information on sleep training. you can probably find it at the library if you don't want to buy it. it sounds like your lo is dependent on you to go to sleep & then stay asleep, and that's why she keeps waking at the end of each sleep cycle.
likely pu/pd will be a good bet for you; we have a whole forum devoted to that. also, here is a link to an interview with tracy. it's really long, but there is tons of specific info in there that can help you form a plan.
the big thing to remember is that once you form a plan you need to stick to it. your baby will cry that you're changing her routine, but you need to stay with her and stick to it; if you cave, it'll take that much longer to change her behavior.
good luck.