。
She didn't want to embarrass him.
Literal
She [topic-は] him [object-を] didn't-want-to-embarrass.
A great example of stacked verbal morphology: the verbal noun 当惑 ('perplexity, embarrassment') + する (to do) gives the base 当惑する; this becomes causative 当惑させる ('cause to be embarrassed'); then desiderative ~たい ('want to') gives 当惑させたい; then negation gives 当惑させたくない; then past tense gives 当惑させたくなかった. Five layers in one word — causative + want + not + past, all on a Sino-Japanese ~する base. Reading this requires unpacking the suffixes one at a time from the inside out.