J.J.
try giving her a responsibility.. such as when you change the diaper she has to get the diaper and unfold it and hand you the wipey. also if you put them both on the floor and have her teach the baby to play with her toys. have her hold the baby while she is sitting dwon because she is "helping mommy" by holding the baby. if she is more involved in her cae she may get better. also i recommend individual time with her without the baby. maybe a park or just a walk aroudn the block. when my 2 boys were growing up we always had dates. sometiems it was jsut 1/2 hour at a time but they both new that when it was their time the other one couldnt bother us unless it was 911 time.