Ready for the Big Girl Bed?

Usually at night, I take Elana into the room and close the door.  I lay on the futon.  I start Elana on the futon.  She does not stay there.  She will walk around the bed about a million times.  I will pull her back onto the futon.  Eventually she will drift away to sleep.  Last night, she did what she usually does.  One change happened, she climbed onto Michelle's bed and fell asleep.  Michelle's bed is a normal twin bed.  It does not have a side railing.  I could not let Elana sleep there.  I would be worried that she would roll off the bed.  I wonder if she is getting used to everything?  Maybe that could lead up to her sleeping in a bed of her own.