By Jennifer Sieg Jennifer Sieg speaks with Amanda Gummer, the former child psychologist and British entrepreneur who found out how to make a living by playing with toys. Now, she tells Ambition A.M. how she did it. As any entrepreneur will tell you, free time isn’t something that comes with the job. Whether it’s taking calls on the beach or hoping the signal holds on a busy train between meetings, entrepreneurs rarely have any downtime. When I managed to get hold of Amanda Gummer, the founder of toy consultancy and research firm Good Play Guide, she was on the way back to Leighton Buzzardfrom …