Posted 4/21/2016 9:35 PM (GMT -8)
Your mother has Hyperthyroidism which appears in her TSH and Free T3/4, also her thyroid US shows goiter, cyst and nodules, which is why she need to see an Endocrinologist .
Is she on any thyroid medications? has she been tested for thyroid antibodies? she should get tested for TGab, antiTPOab and TSIab, the first two confirm Hashimoto's disease which can cause both hypo and hyperthyroidism, the last one is indicative of Graves's disease which causes only hyper.
Ask you PCP for a referral to an Endo!