I don't know what to do?

So I bought a horse for my kids, she’s a great horse. But today I got a message from the original owner. That she would like to buy her back. She explained why she sold her and I honestly felt bad why she had too. The people who we originally bought her from where he friends that she had to sell her too. This horse was rescued by this lady she trained her and nursed her back to health. And did ever ounce of her training. The lady offered me $2000 for her. She had an amazing facility now, and is a farrier. I feel like she should go back to her original owner as her and my horse had a really great bond. She wasn’t pushy about it and said if it’s a no that it is ok.
I don't know what to do?
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