Anyone else still struggling with tummy time?

My daughter is 19 weeks and is still having a hard time with tummy time. She can lift her head for about 10 seconds before getting tired, and that’s with a towel rolled up under her chest to help. No signs of using her arms to push up or anything. I put her on her tummy about 3 times every time she’s awake, for 5-10 mins. Without the towel roll she just lays there and doesn’t do anything. I don’t know what else to do! Otherwise she is incredibly strong, holds her head perfectly, can stand supporting her own weight, and is starting to try to sit up by herself.

Cute picture from this weekend at my riding competition just cause why not 💕☺️