Faith of Metta Pederdaughter Offerdal

My 3x great grandmother Metta Pedersdaughter Offerdal, born1803, was married to Ola Johnsen Offerdal in 1826. He died 1836, and then she dissapear. She had a daughter Synneva, born 1822, with Hans Nilsen Offerdal. Syneva got married to Per Anderson Fodnes, and are supposed to have emigrated to USA in or around 1847, possibly with 2 children. It is possibly that Metta went with them. I am looking for any information that confirm wheater she left with them or not, and if anyone know anything at all about her.