What to do according to reports?

During general thyroid check up she told doctor that she is feeling a node below her left underarm. In FNAC report it came out as Metastatic Carcinoma . For detecting primary origin doctor suggested biopsy test in breast ,where she had a node since her childhood. In biopsy report they were not sure about the malignancy in her breast node. But in ultrasound it's showing many small nodes and that lump. As the doctor is breast surgeon.Doctor suggested for operation of breast to take that lump out and send it for further lab test for malignancy and told us that further proceeding will be on that report basis. So we decided to go some other doctor for consult. We took that FNAC slide and biopsy tissue. In new hospitals lab they told that FNAC slide no is not matching with the sample no in report papers .We called previous hospital lab attendant regarding it ,he told it was just a mistake in typing during lab reports.WTDo next?pls suggest feeling helpless and afraid. for my sis .anyone pls.