It depends on what gty category you booked. On Oasis class there are two.
XN is a neighborhood balcony gty
XB is an Oceanview balcony gty.
Not sure it will show on your invoice but you can call and ask Royal what category you have booked. It shows on invoices travel agents send out but I'm not sure if it does for invoices generated from the consumer website.
TA's can see what is issued by Royal but Royal cannot see what is offered by the TA until the TA purchases the OBC for the client.
All of the OBC issued by Royal that shows up in your cruise planner is listed on the invoice and they can see what each OBC was issued for when they go into your booking.
You need to ask your Ta as sny restrictions are their rules and not Royals.
Royal allows the combination of next cruise and shareholders obc and even group obc can be combined with that.
To be honest it sounds like old verbiage from before the shareholders obc was changed to become less restrictive and has not been updated.
Then ignore everything that has been said about birth certificates as she will need a passport to cruise.
She can do the check in at the pier. She does not need to have a check in time but can just show up with the rest of you at the time that you were given and they can do her check in at the pier.
Group rates are only available for double occupancy staterooms in certain balcony staterooms and below. The only exception was Icon where there was limited availability for group rates for some quad cabins but those could only be held for 30 days and not as part of the regular group inventory
It will look like any other balcony room on Oasis or Allure that has the bed by the balcony. The connecting door will be immediately on your left as you walk in the room.
If you are allowed you have to call to book it or use a TA. TA's can get holds that range from 7 to 30 days for cruises that are 3 months or more from sailing and a bit less for the sailings that are very close.