baby stopped lifting head during tummy time

My baby was born September 2nd. She's 11 weeks old. She has always loved tummy time and been great at lifting her head up. Last week during tummy time she started fussing a little so I propped her up on the boppy and she was fine. I kept propping her on the boppy the following few days and I tried to take it away yesterday and she won't lift her head at all, she just cries. I really want her to start trying to roll soon and she won't be able to if she's propped up on her boppy. Any ideas on how to make her like tummy time and lift her head again? Did I do her an injustice by putting her on the boppy in the first place? 

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