If it's a cold, then it's caused by a virus and has to run its course. But you don't know for sure if it's a cold. I've had plenty of guinea pigs over the years and have found that if they're the least bit chilled or in a drafty area (under a heating/AC vent for example or near a window) they tend to get sniffly. Keep her in a sheltered area away from breezes. You can see if she improves but again, we don't know exactly what's causing the problem. It's a risk to ignore it but only you are on the spot, can see how she's behaving. Don't wait too long.
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