Also check this article on baby sleep, Will be very helpfull http://www.babychakra.com/learn/370-14-things-that-affect-baby-sleep-and-ruin-your-night

oh u mention it early.Making more activities at day and less day sleep,making sound atmosphere at her bed time with light music n stories.also make her tummy satisfied and avoid heavy n gasy food at night.also many helpful article on babychakra are available about this.

Her age?

1 n half yr baby is baby elder enuf to understand the bed tym routine..set it for ur baby. try to play with her during day tym n make her understand that at nite u have to sleep. by doing some of activities u can set her nite forexample: playing a quiet game giving your baby a bath changing her into her pyjamas reading her a bedtime story singing her a lullaby giving her a gentle massage kissing her goodnight. close doors n windows cuddle her alot while sleeping..make it a stress free tym. don't irritate her so much...make sure she had her dinner properly. m sure this things will help her to sleep

You may also find these articles very handy and useful. Do read through them. http://www.babychakra.com/learn/252-5-steps-to-sleep-training-success http://www.babychakra.com/learn/1494-bath-or-cutting-down-naps-whatever-works-to-get-my-baby-to-have-a-sound-sleep-please http://www.babychakra.com/learn/370-14-things-that-affect-baby-sleep-and-ruin-your-night