Tummy Time - please help

I do tummy time with my daughter for about an hour in the morning and an hour at night. And I feel like we are getting nowhere. Her legs are super strong but her arms are lacking. Is there something I am missing that I need to be doing?? I am a FTM and don’t really know what I am doing at all. She is trying her hardest to crawl and can pick her back end up, but can’t seem to push herself up in the front even just onto her elbows☹️. Please help