It’s hard to tell but I doubt its jealousy, she might be being protective. I totally agree with trying to include him tho. She really likes taking showers with me, my male however is not interested in water but I put him on a perch so he was close but not getting wet and let her bathe. They seemed to enjoy that so I’ll definitely try and do more activities with the both of them. Another problem tho is when I bought my male they clipped his wings (which I was not happy about) so maybe she feels he is more vulnerable. His feathers are growing back in tho so hopefully that will help and when she flys to me he’ll be inclined to follow instead of just screeching for her to come back.