Oh, Goldy is only 7 months old, way still a baby finding out life and way too young to introduce to your girl of 3 yrs with any expectation. May be possible but not for at least another year. She will only be seeing him as a pesky baby. Their cages don't necessarily have to be side by side, just in the same room. Teach your boy to sing a tune which can be anything, but will be his swan song. She will listen and learn. Don't expect too much too soon. Wait another year, introduce a nesting box in her cage at breeding season, and if...never a done deal...she accepts him, they will do the deed...so to speak. Can't force against what nature has a doing. Thing is, don't buy a tiel for a tiel as it will not always work out the way you expect. Birds are birds, afterall 😕