As others have said, Small Claims Court. Been there done that, Also maybe a letter from a Lawyer threatening action will shake her up. Worked for me. A verbal contract is also binding if it has been established as an accepted method of business by both parties. Good Luck
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer