She could lay between 5 and 7 as normal, or perhaps more. Just make sure she has plenty of cuttle bone and mineral block available to her. You should let her sit on her eggs as long as she likes. Eventually she will tire of it and abandon them. Then you can remove them. If you take them out before that she may keep on laying more, which will stress her body.
My Budgie is Egg Laying With No Mate!