Dear L.,
From my experience you and your husband have been luckier than most, to have the years of privacy you have had. My perspective is very different, I am a homeschooling mom who used to have a very demanding career out side the home, before kids. Your daughter is 3. She is still a toddler and very very young, also the youngest. The surgery may be a part of this, but I think there is another part you should consider. She is reaching out to both of you at a time- that in her mind, may be all her own. You may not like my suggestion, we went through a similar situation. Our Mater is on the main floor, so my daughter(the youngest) would climb down the stairs at night and sleep at the foot. Mind you, we are homeschoolers. We decided to put a small toddler sized bed in the corner of our room. At night we tucked her in and closed the light. We would come to bed much later. She was not allowed to bring toys, to get dressed in our room or do the things she would normally do in her own room. After a few weeks we decided to it was time to spruce her room up a bit, so we,with let her guidence,allow us to move furniture and an we purchase one item, an inexpensive deco pillow. For a few nights she wanted to sleep in her new room, then she came back to ours- her little bed was waiting. Eventually, after a few months she settled back in her room. She is nine years old now, I asked her why she needed to be with us. Her answer was simple, I just wanted to be a baby again, and be close to you and daddy. I asked her did it help. She said it did, but sometimes she feels like she wants to do that, but she gets sleepy and forgets to come down the stairs. I told her anytime she needs to be close to us, just let us know! D.