Sleeping in crib

I am a FTM and my LO is 3 months she only sleeps in her bouncer i have given her naps in her crib trying to get her used to it but she only sleeps for like 10 mins top before waking up. She is getting to big for the bouncer and i feel shitty that she sleeps in it. So my question is how to make her only sleep in her crib?