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You would see maggots moving around on the poopy vent or on a wound. Those may be below the vent from pecking or injury. Here is a good video of a chicken with a wound whose owner discovered maggots at the 4 minute mark:

Maggot larvae sometimes will be laid (by flies) on poops around the coop and run, and when they step into it, it may get on their feet. When chickens have a wound or a poopy vent, maggots can cause fly strike, a dangerous condition in chickens. Hopefully, this is not evidence of that.

Make sure those are not maggots. Check her vent for any maggots on a poopy vent.