Why Did I Do That?

So here's the thing. My kids, they're young, six and eight, and like every parent, I want them to be well-behaved, kind, and respectful. But there was this one incident with my daughter that has been eating at me for weeks now. Let me set up a bit of context: She's always had issues sharing toys with her younger brother. It isn't just him either; she doesn't like to share much of anything. We've tried all sorts of strategies, sticker charts, rewards systems, even punishments, but nothing seems to stick. The day this incident happened, we were at a local park where kids are supposed to share equipment and play together. My daughter had brought her favorite toy, a small dollhouse with some miniatures, and she was sitting on the swings, playing by herself while the other kids looked enviously at it from afar. I tried talking to her beforehand about sharing, but she shook her head stubbornly, so there wasn't much more to be done. The moment came when one of the little boys approached her with a hopeful smile and asked if he could play too. And instead of just politely saying no or offering to let him have a turn later like we'd rehearsed countless times at home, I kind of... intervened in a way that felt so wrong afterwards. I stepped right into the middle of them and pulled out my own phone, pretending it was urgent, then proceeded to make up this elaborate story about having to take an important call from work while subtly guiding her toy over to me. My daughter looked confused but went along with it, and I kept talking on my imaginary phone until the other kids had given up hope of playing. When I finally ended the call, she asked why I did that, and I explained it was just a way to buy some time while you figure out what to do. But as we left the park later, I felt so guilty for using this ruse on my child, even if it did 'work'. What kind of lesson am I teaching her? It's not okay to use lies or distractions to get out of something. I just can't shake off this feeling that in trying to shield her from a tricky situation, I've actually made things worse. Am I the asshole here for letting my own insecurities override my child’s ability to face and solve problems herself? It's a heavy question, but it's one I have to ask myself.