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Hi sue!
This can be partly due to her heat. Their behavior can be a little off during this time. Having said that I would suggest you pull back from her a bit and let Andy be her main care taker. That means all the feeding , petting and walking should come from Andy. If all of her needs are satisfied by you, she has no reason to look to Andy for these things.
He can certainly use treats to reward her for coming to him. He may want to start with no leash present and then practice recalls while holding the leash.
Hope this helps!
~T
