How ?

FTM here. My LO is beautifully well behaved and talks a lot for her age. She’s already in full sentences. I take her out to play and in the place I take her to, there are kids of all ages. Some are really rough n rowdy n don’t really talk much but push n shove or scream to have their way whereas my sweet one is talking n requesting. I thought I was bringing her up to be well mannered and kind but I don’t want her to be a pushover or bullied. How do I teach her to hold her own when faced with some of those wild kids?? Being polite works with adults, not so much with kids !