Reguritation in adolescent Senegal

My Senegal child, Suela, is currently about 4 1/2 months old. She will sometimes do the "dry heaving" reguritation movements and nothing comes out. Which I have done a small amount of research on this behavior concluding that she may have a full crop, or something stuck in her throat.

This morning however she produced some pieces of dried banana my boyfriend fed her while in his presence. He said there was some liquid in it, and her beak was a shiny, clear wet. I came in the room while she was re-eating the food she had regurgitated. He said "she just reguritated".. my concern was vomiting. She has been singing, and playful, jumping around the back of the couch, and climbing all over him and me. I don't see any behavioral changes. My question about this, is she too young to be displaying this behavior? or is it possible that she just had some food caught and needed to finish eating it, therefore the reguritation had nothing to do with a show of affection and more for practical eating purposes?

And what is the difference between, vomiting and reguritation? I have tried to look up some information on it, but nothing really seemed clear to me. Most information was explaining the difference in sexually mature parrots (i.e. showing mating behaviors toward their parents). So I figured I'd ask here, since she is still a baby.

Even the babies will "allo" feed, eating food and regurgitating to another. I've had older chicks even feed younger chicks. With vomiting there seems to be more volume and they expel it. With the allo feeding there's less and they usually consume it back down themselves. Yes even very young birds can regurgitate food and not be sick. Allo feeding is also a method of bonding, endearing themselves to other flock members. IMO nothing to be alarmed about.

My caique is about 4 1/2 months old too, and she has regurgitated for me. Nothing to worry about--it's actually good!

Thank you both for the helpful information and reassurance. I am a first time mother and just want to make sure my baby is taken care of and healthy. I'm learning new things every day.

I have included a photo of Suela, eating a greenbean.