With that many troops, for Enike to lose, he would have had to have no magic at all and do nothing for three or four rounds. At least three times more meat. A shooting army of 300 gremlins can't do anything to 10 dragons.

I disagree.
Firstly, the advantage isn't as big as it seems...
Secondly, nothing is said about the parameters and hero levels; it would be good to look at the save.
And finally, the most important thing: this is Neela :) Moreover, by the sixth week, she usually becomes such a tank that you can't run over her with a dozen dragons. I was racking my brain all day and still couldn't remember who I was playing against back then... One of the newcomers. Played Neela for Castle. I had a Necro secondary, he had Kyrre and three Ramparts, which he built up successfully.
We clashed at his place; he even cut off my fifth-week growth — i.e., he had about twice as much meat and higher parameters. As for magic, I had Mass Skin, Mass Shield, and Raise Lich/Necro Horse. I won almost without losses :) There was a moment — his horses (1.5 times more of them) kill one of mine, mine retaliate and knock out two, and so on. We remember that Kyrre has no combat specialty, while Neela has the most powerful one. Killing her in the second month, all else being equal, can only be done with magic.

We spawned next to each other through very powerful dragon guards

That's ГО :)

- I take the wyvern lair with 12 units

And that's a Dragon Fly Hive. They don't live there; they're imprisoned there. And you're like saving them.
I'm talking to a girl on the phone, and at the same time playing Heroes. I tell her: hold on, I'm about to grab a conservatory here... She: whaaat? Me: well, I'm about to save an angel from the griffins and then we'll talk...