If you have had just one spoke break that IMO is no clear cut indication of what the problem is. Personally I'd just have the one spoke replaced AND ask the shop to not only true it but measure and provide you a list of the spoke tensions. If they are not up around 100 kgf they are too low and that would be an indicator of the magnitude of the problem. Low spoke tension leads to metal fatigue in the spokes. If your tensions were low you likely have more fatigued spokes which are ready to snap. Then replacing all of them would be prudent. Or just replace the one spoke and ride. Expect more breakages if you have spoke metal fatigue. If no further breakages occur your good to go. But be ready. Personally I'd rather know my spoke tensions.