The reason that Shirley's testimony was invalid because she's a minor and by that, that memories about the robbery that she remembers could harm her and would most likely be susceptible to the suggestion. That is why the court would make her testimony as invalid and wouldn't consider it in any way even though she is the witness of the robbery.
Explanation: Created to serve as perfectly as possible their workaday <u>function</u>, the wooden storage boxes made in America’s Shaker communities are now <u>valued</u>for their beauty.