Mrs Diane Davies told ITV Wales she was delighted the case has been dismissed.
"We have achieved a lot. But that doesn't mean this is the end, I want the police to admit their mistake and that they will go all out and try and solve this case and find the culprit".
More top news
Fire crews have been responding to reports of flash flooding in Carmarthenshire. Some homes have been affected.
Medication designed for animals was taken from the building in Abertillery on Thursday night.
More than a thousand riders will be taking part in a series of events in and around the town.