Baby rolling over

El
My baby will be 4 months old on the 29th of April and I was wondering when y'alls babies rolled over? She doesn't like tummy for very long and she usually spits up even after a while after she ate. She looked like she was trying to roll over a couple weeks ago but hasn't really since. I want to help to try to roll over she does everything else and has reached her all milestones for weeks now. She just isn't showing much interest in rolling over. So my question is how old were your babies when they rolled over and do any of y'all have any tips so that I can help to begin to learn? Or is normal for her to not really be trying to roll over yet or that she hasnt rolled over yet. Am I just over thinking?? No rude comments I'm not trying to rush her I just want to help her begin to learn how. I just want to do everything I can to help her and make sure I'm doing everything I'm supposed to help her reach her milestones. Again please no momshaming or rude comments. I attached a picture her trying a couple weeks ago and that was also the first time she tried.