I don't think she should be constitutionally compelled to see him for a while, just till it all dies down. I wouldn't like to be in close proximity to someone who had done a thing like that and I'm not that old or posh.
And it must be so much more squirm inducing, for them both on account of them being related. If I had to be near some one who had degraded himself publicly, in the head of a dead animal I would feel uncomfortable. But if I was actually related to them it would make it so much worse.
Still at least Piggate has probably cheered up Ed Milaband a bit. I imagine he has been down in the dumps for a while. I remember when the day after his defeat and he had to stand alongside Clegg and Cameron for the ceremony to remember the war dead and felt bad for him. I bet this makes up for it.