Baby shower advice

My best friend and sister have offered to throw me a shower. Which I'm so grateful for. However I feel like I should be helping or at least giving ideas of what we want at the shower. My sister is only 22 and I know doesn't have a lot of money to just spend on a shower which is why I feel like I should help, but my friend keeps telling me I have no say BC its a surprise. Should I say something about wanting be involved or just let them do what they want at the risk of the shower being someone I totally didn't want? (She hasn't even asked for any ideas of what kind of things I'd want or anything) the only thing I've had say in was making the invites which I'm absolutely in love with but feel I should be doing more. Maybe I'm over thinking?