Ashley had no reason not to trust the twins’ word. If Alexandra had already revealed anything about the secret dealings of the Marauders, Dumbledore would have acted as soon as possible. They couldn’t have had a private conversation in his office; otherwise, Phineas would have informed Sirius and Remus in an instant. And anyway, it wasn’t like the twins wouldn’t have foreseen the whole thing. They weren’t Seers, that had been established, but Ashley still didn’t know what they were. That was a conversion that would need to happen sooner rather than later, but definitely not now. They had other, more urgent things to attend to.