She might well be ready for less napping, and she's simply wide awake. Along with that, she might need more exercise, so she will be tired at night.
Is she in daycare as perhaps they get long naps during the day, if she is home with you what time and how long does she nap for ? By going in and laying with her she knows that if she yells you will do that, this is hard to do but it does work after a few nights, each time she comes out of bed you take her back, you do not lay on the bed with her,and by taking her into your bed you are sending mixed messages so that has to stop.Take her to bed, stories, kiss goodnight and leave, she will yell she will come out, quietly, no talking to her, take her back, yes its exhausting but once she realises you are not going to back down she will give up. Good luck