One nap trouble

Is/has anyone else’s little ones had trouble transitioning to one nap? My daughter will wake up at 8am play,eat,snack then by 1030 she’s whiny and in a mood. I’ve been putting her down at around 12pm for a nap but 30min later she’s awake and crying so I go in there and put her back down which normally helps for another hour or so. I’m just lost when we were doing 2 naps a day she would fight them or only nap for 30min that’s why I’m trying this transition. I figured letting her play and be awake longer she’d sleep longer all together.