To be honest I really think yuh should refrain from moving her to a separate feeding box !
I can't guarantee it will make any difference but I'm sure it will .
The days of feeding boxes are long gone - its generally advised to feed in their viv / tub nowadays.
Kinda sounds as though its gonna be a great feeder and it's hungry at the same time .
I'd leave it to settle for 5 days minimum then ... on feeding day put a couple of pieces of card down in the viv in the morning and then in the evening feed over the card just so no substrate is eaten with the mouse / rat .
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