Transitioning baby to SOMETHING!

Tia

My 6 week old baby is currently bed sharing with my mother and I.... hubby feels scared to do it, but supports us (after several sleepless nights he agreed). She sleeps amazingly! Sometimes only waking up twice the entire night for a feed. Its taking a toll on daytime sleeping though. She only sleeps in our arms and won’t get in the bassinet to let us eat or even go to the bathroom. I want to transition her into a bassinet at night too... or even her crib so she gets used to it... I need her out of the habit of ONLY sleeping in my arms or right next to us. What can I do?

We actually have 3 bassinets, a crib and her own nursery but we gave up and ended up bed sharing so we could all sleep.