My sister gets sweaty palms. Has not been diagnosed any anxiety but has been diagnosed migraines. No other anxiety/panic symptom.

May be hyperhidrosis. Sweaty palms can be due to a condition called hyperhidrosis, which can occur in otherwise healthy people. About 2-3% of population suffer from excessive sweating of palms, feet, or underarms. Have your sister ask her doctor which treatment may be best for her. There are prescription antiperspirants that may help, and some oral meds (with side effects). Help is available, good luck!