Baby sits up in crib for nap time

My baby girl 😂aye yi yi, just look at her cute face in the picture peeking through the slates. She is so funny 💗😆but it's a problem! Lol.

When it's her bedtime or nap time she sits up in her crib and just starts bouncing! If and when she is really tired enough she will eventually fall back and go to sleep. The problem is she's not always facing the right direction to just "fall back" safely and can hit her head against the wood.

I need help on what we should do?

Is anyone else's baby doing this? My mom told me once she can sit up or stand in the crib it would make nap time and bed time more difficult 😩