You should be proud of what you are doing.
I have been taking care of ringnecks, (over a dozen), for over four years now.
Not to worry. This is the look and sound of a very happy dove that loves you! EDIT: The tongue in the beak smacking movement is a "I love you sign". Keep up the good work! She/he is talking to you. For predators its different like a question (is it all right?!) and they don't make the smiley blinking eyes. Also one looked at me and made a similar but more pleading like sound and labored preening action when she was cold. Turned up the heat and she made a sharper similar sound and rapid preening action. So you will learn by the tone and actions what they are saying.
I use a wood clothespin on the cage with fresh baby spinach leaves clipped to it. They like it.
I put sesame seeds with their grit in a bowl and tell them it's time for treaties sweeties.
I give them a good spray with a (clean dedicated for doves) spray bottle. Sometimes they squat down and raise their wing and make a happy sound like in your video as I spray them.
They like sitting in a little basket with pine wood chip bedding. Misty, Stormy, Safron, Marble.
When one makes that solefull coo as an egg is coming they pile into the basket with her. It's so adorable. I have the males (2/cage) and females (4/cage) seperated.
I took my golden baby with me into a warm shower (careful not to flood their face/nostrils or they can choke and can get pneumonia like complications) and she made this sound the first time. Dab off the water a bit. Then she likes meditating under a towel, sometimes for a couple of hours.
They all have different personalities so you have to let them tell you what they like.
I played different music and when she didn't like something (American Band) she would give me an angry bird look and coo at me harshly. They mostly like melodic gentle music. They will make a little bark noise similar to the video and preen happily when it's something they like. (
) as an example.
I can tell the way she looks at you and makes this sound that you have a very close and attentive relationship.
If you have them out and want to put them back in, do not chase them. Not a good thing. Turn off the lights, (they can't see in low light conditions like we can), then you can put your hand under them and they will step on to it, no problem. Sweet soft birds.