My eldest son was VERY frustrated because we couldn't meet his needs. He does have autism though. Actually, both of them do, but ds2 never cared enough to get frustrated.
ds1 got into rages when we failed to understand what it was he needed us to get or do. He didn't really talk at all (apart from small number of single words to communicate most basic needs) until well after age 5. We found that the tantrums decreased as his vocabulary increased, so definate link there.
with ds2, he didn't talk, not because he couldn't but because he didn't want to, so he didn't find it very frustrating at all
So yes, if she WANTS to get her message across but can't then she must be tearing her hair out!!
I knew a woman who had a daughter with speech delay. Well, she spoke nonsense. Garbled. Displayed a LOT of frustration. In later years, after lots of salt, etc, she was able to talk and said about that period that she THOUGHT she was talking normally! In her head, the words were fine, but somewhere bewtween brain and mouth, they got garbled. This drove her NUTS as a youngster, because as far as she knew, she was TALKING and she couldn't understand why people didn't understand her.