Why did my Minecraft sheep come back, on her own after I killed her?

I think it may be a side-effect of a corrupted Minecraft world, but I can't quite be sure.
So, I killed the sheep as a result of my game lagging and when I went outside of the school to the playground area, I saw it even though I had just recently killed her.
I have no idea whether this is a glitch, a feature, or a Side-effect of a corrupt Minecraft world. It also could have been my brother.
Best Answer
It was probably your brother. If it was laggy, then it might have reset. Did you still have Ms.Fluffy's drops? If so, it probably reset her, but not your inventory, but I think it was you brother.
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How do you kill sheep in Minecraft?
To kill a sheep, you need to inflict 8 points of damage to the sheep.Where does sheep spawn in Minecraft?
In Bedrock Edition, 2 to 3 sheep spawn during the world generation on grass blocks at the surface at a light level of 7 or higher with at least a 2 block space above, except in snowy taigas, snowy plains, ice spikes or wooded badlands. They later spawn individually on grassy biomes. 5% spawn as baby sheep.My Sheep Can't Be Killed...
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