Hii, She doesn't speak much, so you'll have a h ard time understanding her. She doesn't talk much, so you'll have a hard - hared time understanding her. You might say there is not much difference between the two above when the intended message is that she is a woman of few words.
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Clive
If the intended message is that she is a woman of few words, ie she just doesn't converse much, I'd use 'talk'.
However, I wouldn't expect this to make it especially hard to understand her.
I read the meaning like this.
The intended message is that her speech mechanism is poor, due to lack of use. eg maybe she has poor prununciation.