Congrats Julia & Dolly
I'd certainly keep them in their safe box untill she has finished, then get the Sweetheart stout down her as soon as she has shed the afterbirths. She should settle down as soon as the "pains" have gone.
One of my 1st timers was like Dolly last year - I think she thought the pains were directly caused by the piglets that she had already given birth to
She got 2 cans of the old stout & I stayed in with them for a good couple of hours after putting them back with her, she was brilliant with them & no problems with farrowing this year