Grandparents want to take 5 year old to Disneyworld

My 4 year olds grandparents recently asked us if they can take her to Disney world next June (she will be 5 by then) and I kind of want to say no but I’m not sure if that instinctual reaction is based in feeling petty because they overstepped some boundaries over Christmas. My logic is that we would like to take her to DW for her first time but the reality is her baby sister is only 10 months old now so years away from being old enough (in my opinion) to go and I honestly don’t know if we will ever be able to afford the trip even when she is old enough. We definitely could not afford it right now.

I guess I’m looking for advice? I know it’s important for her to have experiences with her grandparents as well but in this moment it feels like they kinda keep stealing our thunder.

Edit: I’m definitely leaning towards letting them take her after reading your comments, thank you all for your input . They are wonderful people and young for grandparents (early 50’s and in good shape) I trust them with her. Safety is a concern for me as we live in the Midwest so she will be far away from us but her GP’s are perfectly capable of taking care of her if an emergency comes up I just know I’ll be an emotional mess while she is gone. She loves being with them and spends the day with them every Sunday. Occasionally when she spends the night at their house she gets emotional and wants to come home but I think they manage her feelings very well so if she were to get homesick I think they could probably handle it fine. Someone said it sounds like I’m jealous and absolutely I am haha I want to have these first experiences with my daughter I don’t think that should be controversial but…it’s not in the cards for us next year and maybe not the year after that either. I think we will probably agree to it with the provision that they try really hard not to cross our parental boundaries while on the trip.