Angun, there is a line in the first version I gave (from "Cas Amhrán") mentioning that father and mother are left sad at home. In that case, it sounds like they are sad because their daughter is away herding the cattle on the mountains.

In the verse which you can see at the webpage referred to in the links above as "as recorded by Birkin Tree"[sic], the it seems the cattle went astray and that is why the parents are worried.

"Ag seoladh na ngamhn' sea d'fhág mé an baile
'Gus ceann ní bhfaighidh mé go lá dhíobh
Tá m'athair gan chéill im' dhiadh sa bhaile
'S mo mháithrín buartha cráite".
"Gheobham cead saor ó mhaor na coille
Féar a thabhairt go lá dhóibh
'S le fáinne an lae beam araon 'nár seasamh
Ag seoladh na ngamhn' fé'n bhfásach".

"I was driving the calves when I left home and I won't find one of them until morning. My father is beside himself at home and my mother is distressed and distraught. We will get permission from the overseer of the wood to give them grass until morning and with the dawning of the day we will both be up and driving the calves to pasture."

Are those the lines you had in mind?