So, my mom needs to know if you can keep a prepared pie in the fridge 24 hours before baking. I googled it, and it didn't work. Help?

I'd assume it would work if the fridge is cool enough. Are we talking homemade or store-bought?

Homemade

If it's a fruit pie, oxidation might soften the fruit if it's a pie without a top crust.

Aside from that, I'd assume it would keep in the fridge.

We do it all the time, it has never had any negative side effects with us.

I think it would be just fine if you put it in the fridge.. but... why the heck would you make a pie and not bake it and eat it right away!? That's mutiny on my ship!

^

I doubt it would have any horrible side effects on the pie. The only thing I would do is keep the pie covered as a "Just Incase" since refrigerator odors might cause the pie to take on some off flavors.

Should be fine.

Probably better to put the top crust on if there's going to be one before hand, and if there's not, cover it (preferably plastic cling wrap but tin foil also works). This is from two opinions, both of us have been baking for years [Not as an occupation, this is my family.]

Well...I wouldn't recommend it, if it's fully prepared. What you're supposed to do it make the dough for the crust, and let it sit in the fridge for 24 hours, THEN make the pie and pour the filling in and all that. Otherwise the filling will make the crust soggy.

It's even been said that you need to chill the dough, roll it and put it into the pie dish, and then chill it again, then fill and cook it.

Based on the OP's wording, the pie was already made before posting. He was just wondering if the pie can keep until a more opportune time to bake it.

Are you sure there is not a maypole ritual somewhere in there?

I think the answer to that is not to put fruit in pies. Meat goes in pies, fruit belongs on the compost heap.