Women sleeping in the same bed

Mufti Saheb, I hope Mufti Saheb is in good health. I have two questions Mufti Saheb:

1.) Is it permissble for a married women to sleep in the same bed with her unmarried girl cousin who is elder than her regarding the bed to be big?

2.) For that matter is it okay for two baaligh girls to sleep in the same bed? Is there any gonna (sin) if they do?