nvstac,
You need some moore opinions...go to a top notch otosurgeon.
Some of the anomalies:
Otosclerosis is almost never the cause of problems for a child, typical age of serious hearing problems is 30.
Otosclerosis doesn't typically tie in with sensory-neural loss, though both COULD occur independently. Again, age is a bit of a problem here.
Steroids are usually for an infalmmatory process so that's confusing too.
Your daughter's conductive loss is SLIGHTLY a more rational diagnosis but I really have trouble comprehending extensive otosclerosis in such a young child!
Do you or your spouse have otosclerosis? It's highly familial.
You might benefit by reading the gargantuan STAPEDECTOMY (called STAPEDECTORMY

) thread down the page a bit.
Yes, I think fluoride in small doses might be appropriate once the oto is confirmed.