English translation:

The witch's dark curse
between the mist and the heather,
binds your destiny.
They exist, that much is certain—
their queimada burns deeper than words.

#TankaThursday #TankaPoem #micropoetry

'Pequeña' literally means "little" or "small", that's why it's also used to refer to children. 'pequeña' here acts as a personification. The substitution for "slightly" is not bad, although I would've translated it into something like:
"The earth trembles, small,
before the unleashed thunder"

Thanks for taking the time of translating my tanka, that is no mean feat. I'm glad you enjoyed it :)