A Mother's Heart is a quest the wiki lists for Vale Sangora, built around a fight and the conversation that follows it. Guide sites have not covered it under this name yet, so details are thin.
The quest pairs a fight with a conversation afterwards. We could not confirm where it starts or who gives it, so check back once more guides cover it.
Do not mix it up with A Mother's Plea, which starts in the Uriash village after Song of the Mountain and sends you to find Ocha in Svartrau.
A Lone Wolf's Hunt
A Lone Wolf's Hunt is the ending you get by storming Greifberg Castle on your own, without Crake's or Lacra's help. It ends in the final fight with Brencis, so save before you go in.
Image: Rebel Wolves / Bandai NamcoA Mother's Plea
A Mother's Plea is the Uriash Elder's request to find her daughter Ocha in Svartrau. It only appears if you enter the Uriash village peacefully, and it pays out the Soul Stigma Manual.
Come Hither
Come Hither is one of the Sanzhani favours that open after Good Home. You follow a sanzhana to its burrow and kill the murohn living there, and it counts toward Letters to Lunka.
Good Home
Good Home opens the Sanzhani questline: a fairy named Heile asks you to find her missing brother Tonis. Finishing it starts Letters to Lunka and four more Sanzhani favours, whatever you choose.