DD (3.5) refuses to join in football class - how to encourage without pressure?

[theory]

I signed up DD for a Sat morning football class because she said she'd like to go (she did a term when she was 2), but now she refuses to play. She's not very dramatic in her refusal she just sits on the picnic blanket with me and the other parents and hangs out, saying "I don't feel like it" if we try to encourage her to get out there. I'm not sure how to handle it. On the one hand, I'm fine with her just watching until she feels comfortable (it has been a month). But at the same time, there's a certain awkwardness to her sitting there the other parents keep asking her why she's not playing, and I sense that the longer she sits out, the harder it will be to join in.

She has a friend in the class, and as I said, she's played before, so it's not a totally alien experience for her. But the other class she did was
with a nanny rather than me, and I wonder if that makes a difference: she's very clingy with me in general, and esp since her little sister came along 5 months ago. She's also said she doesn't think she's very good at football- though in truth, I think this is something we maybe planted in her mind (by asking, stupidly I suppose, whether she was concerned that she wasn't good!)

I'd be lying if I said I enjoyed the hour with her sitting out I find it awkward tooand I'm sure she can sense that. Should I stop taking her? Keep sitting?

my ds (3.5) was like this ith swim lessons. so i dropped them. i tried every possible brides but none worked. i told him off, removed toys etc.. nothing. i think he is not ready

Just stop taking her she is only 3 and a half and that's a bit young for a football class, In fact I'm surprised there are classes for that age around here a child can't join a football class until they are at least 6.

Surely she doesn't need to go. Maybe it doesn't suit her so perhaps look at alternatives or just go out as a family and she can still go and watch from time to time if interested.

update from yesterday: she went with DH and had a great time playing! We told her ahead of time that it was fine if she didn't want to play but that we wouldn't be staying if she chose not to. I also said she could wear a dress, which I had talked her out of before. I'm not sure what made the difference exactly- DH thinks it was my not being there most of all. But she really enjoyed playing and came home saying she was proud of herself. Just updating for people who might face similar situations. Thanks to everyone for input.