help please! tiny white maggots!

hi folks, went to check on my ladies today and noticed some drooping leaves on one. she is an ex mother, in flower, and the only one of my plants in a soil mix. the others are in a wilma system in clay pebbles. her pot is sitting on a thin layer of clay pebbles in a saucer. on close inspection i noticed a bad smell, kinda like ammonia, and tiny white maggots in the runoff water around the pebbles. there are no flies/insects in the grow area and ventilation is good, humidity and temp too. anyone seen something like this before? any steps i need to take to take to help her/protect the hydro system? any advice much appreciated. see pics.

Standing water in your growroom, anywhere, for any reason, is going to give you problems.

Get that liquid out of there pronto and let your pebbles dry out- clay pebbles are designed to go through cycles of wet-dry-wet-dry several times a day, otherwise you see bugs and rot, eww.