Thanks for sorting this part out where I had mistakes.
Grace
þóttist hún þar enga
she bethought-herself (that she) there
uppreist fá mundu. Eftir það lætur (láta) hún gera
(göra) knörr í skógi á laun.
would obtain (fá) no reparation (see uppreist, Z2) /
vindication of her honour / revenge for her sorrow. After-that she
causes (láta) to make a knorr (ship) in (the) forest in secrecy