How to potty train girls?

My daughter is 3 and a half years old and still not potty trained. She will pee on the potty but not poop. When she is in undies and I ask her every 5 minutes if she needs to go she will still pee in them. I have tried reward systems and huge excitement when she does pee in the potty. But I don’t feel like we are actually getting any closer. I know this should not matter, but I also feel like I’m getting a lot of judgment from other people because she is not. She is my oldest so I’m seriously questioning if maybe it is me doing it wrong. Any suggestions or tips would be amazing! Also if I’m not alone and this is not that crazy that would be nice to know too. Thanks mommas