Help!!!

I have been trying to consistantly follow the easy routine forabout 12 days now with my 9 month spirited lo. She eats between 6 - 8 ozs at 7, 11, 3, 7, has 3 meals a day and cereal at bedtime. so here is the problem Some nights she will wake and hour or two after bedtime which I suspect is b/c she is overtired (we are working on that IE extending naps, earlier bedtime,etc), but some nights she will go for a stretch of 3 - 4 hours than she will wake every 1.5 hours. This is better b/c she used to wake every 45 minutes. I go in reassure her, put her back on her back (if she has flipped around) and help her get back to sleep. So what's the deal? I have extended her naps but every 1.5 hours usually between 1 and 5 give or take a bit is rediculous, what do I do. I don't pick her up I don't go in until a full blown cry, so what is next? HAVE I BECOME HER PROP and if so how do I stop it?

tinytatsmom