Tummy Time

My 3 month old always spits up during tummy time. I make sure to wait a good amount of time ( at least an hour after she's eaten ) before we try, but no matter what, after about five minutes she spits up. I've tried propping her up with the bobby and using different pillows, but nothing seems to help. She has great head control, but struggles to roll over and prefers to just be on her back when she's on her jungle gym. Any advice to help her not spit up every time? It makes her very fussy, which I can't blame her when she's rubbing her face in her puke 😅