I highly doubt it will be for an actual show. I think people tend to know when there’s shows being cast and nothing which would suit her is casting. Can you imagine her being in a show and leaving Mabel with someone else? Who else is going to eat her feet and stick few nose inside her mouth to sniff, only her Mumma will do.
I’d be surprised if she does a pantomime again as, however much we think she’s a dick, it’s a LOT of shows and it’s Mabel’s first Christmas. She’ll be posting visits to Santa, Lapland uk, polar express etc all with her face covered by an elf.
Unless she’s struggling for money having not been on the west end for so long and needs the panto money. After all, Mabel won't remember if mumma was there or not!