ее было трудно понять, так как она

ее было трудно понять, так как она плохо говорила по-русски

Результаты (английский) 1:

It was hard to understand because she spoke Russian poorly

Результаты (английский) 2:

it was difficult to understand, since it does not speak in Russian

Результаты (английский) 3:

it was hard to understand because she doesn't speak russian.