It could be that she is in difficulty delivering her babies. If something whitish comes out and then goes back in it is possibly a baby. Sometimes they get stuck. thye should come out head first but occasionally they come out tail first and the little fins act as a stoppage. Thus the mother and the baby sometimes die.
A lot of the antiparasitic medications are toxic to fish-- it makes them sterile for a while and also will kill the fry.It sounds more like she is trouble with delivering-- at least to me. I have seen that before.
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mousey
Toronto. Canada
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