is there a certaib room to book so we can request a role away with king room for daughter.?
Believe you should contact the hotel directly ... I am not sure about the roll away bed options / rooms that are available for this item.
If you contact them, they can advise you on the best room to request and what they have available for the rollaway or crib. Some of the suites might also have the sleeper couch.
Get an answer from St. Louis Union Station Hotel, Curio Collection by Hilton staff and past guests.