@Miseryl
So she can't read multiple road signs that she had ample opportunity to see? That is dangerous.
It's also dangerous to unthinkingly drive down that road at 30 MPH, assuming that it's the narrow road next to the park, with all the parked cars and 20 MPH signs, which it probably is, because the 3 other roads with that name are all national speed limit roads mostly.
A good driver, paying attention to the task in hand, will instinctively drive slower than 30 MPH anyway, and be mindful of having to slow down frequently due to pedestrians immerging from between parked cars, doors opening, cars pulling our or coming the other way, turning out of junctions, the slalom features, etc etc.
If the friend ends up with an offer of a speed awareness course out of all this, she should take it, because that's exactly the sort of thing she will learn, appropriate speed for the conditions, which isn't necessarily the same as the speed limit, and how to tell what the speed limit is for a particular road if you can't see any signs.