Imperfect tense of "moyn " in the negative as a dependent clause

Bore da,
I am currently doing L2 H24, and struggling to understand the 2 different Welsh versions of similar English phrases.
You’d tell me she didn’t want to go "----nag oedd hi’n moyn mynd, "
You’d tell me she didn’t want to answer “----bo hi ddim yn moyn ateb,”
Both are preceded by Byddet ti’n dweud wrtha i

My question boils down to “which one to use when”.
Diolch yn fawr.