Monthly goals

How are we going to accomplish rolling over from tummy to back when my daughter hates tummy time! She hates it! The other day she only lasted 40 seconds and then she started crying....I try to let her lay there but she will get to a point to where she’s crying so bad it’s hard to calm her down. I don’t understand why she gets so worked up. Yesterday she made it 4 minutes and 30 seconds...don’t know how...she cried off and on but not very hard...I was just letting her go since she was going good. Today we only made it 1 minute. She gets so upset about it I hate even making her do it. Does anyone else have this struggle?